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1.<span style="font-family: 宋体, SimSun;">某物体做匀变速直线运动，在运用公式<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999825495" data-fileid="1394308630967202138" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898656690446675" data-bin="http://file.ewt360.com/file/1397898656690405449" data-id="104061" />解题时，若取初速度方向为正方向，则下列说法正确的是（　　）</span></div><br/><br/>
A.<span style="font-family: 宋体, SimSun;">匀加速直线运动中，加速度<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999833279" data-fileid="1394308630967202139" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898665280348692" data-bin="http://file.ewt360.com/file/1397898665280356624" data-id="1445" />取负值</span></div><br/>
B.<span style="font-family: 宋体, SimSun;">匀加速直线运动中，加速度<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999817303" data-fileid="1394308630967202140" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898665280381209" data-bin="http://file.ewt360.com/file/1397898665280340008" data-id="1445" />取正值</span></div><br/>
C.<span style="font-family: 宋体, SimSun;">匀减速直线运动中，加速度<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999849769" data-fileid="1394308630967202141" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898665280348693" data-bin="http://file.ewt360.com/file/1397898665280356625" data-id="1445" />取负值</span></div><br/>
D.<span style="font-family: 宋体, SimSun;">无论匀加速直线运动还是匀减速直线运动，加速度<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999817302" data-fileid="1394308630967202142" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898665280381210" data-bin="http://file.ewt360.com/file/1397898665280340009" data-id="1445" />均取正值</span></div><br/>
++++++++++++++++++++++++++<br/>
<b>正确答案</b>: ['B', 'C']<br/>
解析:<div class="mst-editor-mce-root-block"><span style="font-family: 宋体, SimSun;">物体做匀加速直线运动，速度方向与加速度方向相同，由于初速度为正值，故加速度也为正值，<span style="font-family: 'Times New Roman';">A</span>错，<span style="font-family: 'Times New Roman';">B</span>对；匀减速直线运动中加速度方向与速度方向相反，加速度应取负值，<span style="font-family: 'Times New Roman';">C</span>对，<span style="font-family: 'Times New Roman';">D</span>错．</span><br /><span style="font-family: 宋体, SimSun;"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>故选：<span style="font-family: 'Times New Roman';">BC</span>．</span></div><br/>
省流:[['B', 'C']]<br/>
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3.<span style="font-family: 宋体, SimSun;">斑马线是行人的&ldquo;生命线&rdquo;，也是驾驶员的&ldquo;警惕线&rdquo;，在日常生活中处处可见车辆主动礼让斑马线的文明行为．如图所示，一辆汽车以<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999833280" data-fileid="1394308630967202143" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898665280348694" data-bin="http://file.ewt360.com/file/1397898665280356626" data-id="172278" />的速度在马路上匀速行驶，当驾驶员发现正前方的斑马线上有行人，于是刹车礼让．当汽车开始刹车做匀减速运动后，经过<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999817301" data-fileid="1394308630967202144" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898673870315916" data-bin="http://file.ewt360.com/file/1397898673870274922" data-id="3483" />恰好停在斑马线前．则汽车的加速度大小为（　　）</span></div>
<div class="mst-editor-em-to-div" style="display: block; font-style: normal; text-align: center;"><span style="font-family: 宋体, SimSun;"><img src="http://file.ewt360.com/file/1397898673870307386" width="185" height="116" /></span></div><br/><br/>
A.<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999833282" data-fileid="1394308630967202148" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898673870274924" data-bin="http://file.ewt360.com/file/1397898673870307388" data-id="721086" /></div><br/>
B.<img class="Wirisformula" style="vertical-align: -1px" role="math" src="http://file.ewt360.com/file/1397898733999849768" data-fileid="1394308630967202149" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898682460225538" data-bin="http://file.ewt360.com/file/1397898682460234056" data-id="169292"/><br/>
C.<img class="Wirisformula" style="vertical-align: -1px" role="math" src="http://file.ewt360.com/file/1397898733999833281" data-fileid="1394308630967202150" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898682460209571" data-bin="http://file.ewt360.com/file/1397898682460241989" data-id="181408"/><br/>
D.<img class="Wirisformula" style="vertical-align: -1px" role="math" src="http://file.ewt360.com/file/1397898733999842079" data-fileid="1394308630967202151" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898682460225539" data-bin="http://file.ewt360.com/file/1397898682460234057" data-id="146672"/><br/>
++++++++++++++++++++++++++<br/>
<b>正确答案</b>: ['C']<br/>
解析:<div class="mst-editor-mce-root-block"><span style="font-family: 宋体, SimSun;">汽车做匀减速直线运动，由<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999825493" data-fileid="1394308630967202145" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898673870291638" data-bin="http://file.ewt360.com/file/1397898673870299512" data-id="104061" />得</span></div>
<div class="mst-editor-em-to-div" style="display: block; font-style: normal; text-align: justify;"><span style="font-family: 宋体, SimSun; text-align: justify;"><img class="Wirisformula" style="display: inline-block;" role="math" src="http://file.ewt360.com/file/1397898733999857868" data-fileid="1394308630967202146" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898673870274923" data-bin="http://file.ewt360.com/file/1397898673870307387" data-id="721083" /></span></div>
<div class="mst-editor-mce-root-block mst-editor-em-to-div" style="display: block; font-style: normal; text-align: left;"><span style="font-family: 宋体, SimSun;">即加速度大小为<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999825494" data-fileid="1394308630967202147" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898673870291639" data-bin="http://file.ewt360.com/file/1397898673870299513" data-id="181408" />，故<span style="font-family: 'Times New Roman';">C</span>正确，<span style="font-family: 'Times New Roman';">ABD</span>错误；</span><br /><span style="font-family: 宋体, SimSun;"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>故选：<span style="font-family: 'Times New Roman';">C</span>．</span></div><br/>
省流:[['C']]<br/>
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3.<span style="font-family: 宋体, SimSun;">图示是某质点的<img class="Wirisformula" style="vertical-align: -1px;" role="math" src="http://file.ewt360.com/file/1400813530735157446" data-fileid="" data-type="mathType" data-wmf="http://file.ewt360.com/file/1400813522145198129" data-bin="http://file.ewt360.com/file/1400813530735141341" data-id="5903" data-client="true" />图像，则（　　）</span></div>
<div class="mst-editor-em-to-div" style="display: block; font-style: normal; text-align: center;"><span style="font-family: 宋体, SimSun;"><img src="http://file.ewt360.com/file/1400816666061275649" alt="" width="172" height="165" /></span></div><br/><br/>
A.<span style="font-family: 宋体, SimSun;">前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999817304" data-fileid="1394308630967202165" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898699640103185" data-bin="http://file.ewt360.com/file/1397898699640119955" data-id="7699" />物体做匀加速运动，后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999842081" data-fileid="1394308630967202166" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898708230046348" data-bin="http://file.ewt360.com/file/1397898708230021831" data-id="87042" />物体做匀减速运动</span></div><br/>
B.<span style="font-family: 宋体, SimSun;"><img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999833284" data-fileid="1394308630967202167" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898708230037614" data-bin="http://file.ewt360.com/file/1397898708230053916" data-id="721079" />内物体静止</span></div><br/>
C.<span style="font-family: 宋体, SimSun;">前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999842080" data-fileid="1394308630967202168" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898708230046349" data-bin="http://file.ewt360.com/file/1397898708230021832" data-id="7699" />和后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999849770" data-fileid="1394308630967202169" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898708230037615" data-bin="http://file.ewt360.com/file/1397898708230053917" data-id="87042" />内速度的变化量均为<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999817306" data-fileid="1394308630967202170" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898708230046350" data-bin="http://file.ewt360.com/file/1397898708230021833" data-id="100307" /></span></div><br/>
D.<span style="font-family: 宋体, SimSun;">前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999849772" data-fileid="1394308630967202171" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898716819972123" data-bin="http://file.ewt360.com/file/1397898716819988660" data-id="7699" />的加速度是<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999842082" data-fileid="1394308630967202172" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898716819980979" data-bin="http://file.ewt360.com/file/1397898716819956040" data-id="721084" />，后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999825498" data-fileid="1394308630967202173" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898716819972124" data-bin="http://file.ewt360.com/file/1397898716819988661" data-id="87042" />的加速度是<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397929752253629182?vh=-8" alt="mathML" data-id="721093" /></span></div><br/>
++++++++++++++++++++++++++<br/>
<b>正确答案</b>: ['A', 'D']<br/>
解析:<div class="mst-editor-mce-root-block"><span style="font-family: 宋体, SimSun;"><span style="font-family: 'Times New Roman';">A</span>．前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999857866" data-fileid="1394308630967202153" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898682460234058" data-bin="http://file.ewt360.com/file/1397898682460250410" data-id="7699" />物体的速度均匀增大，做匀加速运动，后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999842078" data-fileid="1394308630967202154" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898691050176855" data-bin="http://file.ewt360.com/file/1397898691050152250" data-id="87042" />物体的速度均匀减小，做匀减速运动，故A正确；</span><br /><span style="font-family: 宋体, SimSun;"><span style="font-family: 'Times New Roman';"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>B</span>．<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999857865" data-fileid="1394308630967202155" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898691050168708" data-bin="http://file.ewt360.com/file/1397898691050185410" data-id="721079" />内物体做匀速直线运动，故B错误；</span><br /><span style="font-family: 宋体, SimSun;"><span style="font-family: 'Times New Roman';"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>C</span>．根据速度的变化量<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397902023944790190?vh=-4" alt="mathML" data-id="721089" />，得前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999825497" data-fileid="1394308630967202157" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898691050168709" data-bin="http://file.ewt360.com/file/1397898691050185411" data-id="7699" />内速度的变化量为<img class="Wirisformula" style="max-width: none; vertical-align: -1px;" role="math" src="http://file.ewt360.com/file/1429000146968600841?vh=-1" alt="mathML" data-id="760652" />，后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999849771" data-fileid="1394308630967202159" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898691050168710" data-bin="http://file.ewt360.com/file/1397898699640119952" data-id="87042" />内速度的变化量为<img class="Wirisformula" style="max-width: none; vertical-align: -1px;" role="math" src="http://file.ewt360.com/file/1429000189918282497?vh=-1" alt="mathML" data-id="760653" />，故C错误；</span><br /><span style="font-family: 宋体, SimSun;"><span style="font-family: 'Times New Roman';"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>D</span>．前<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999857870" data-fileid="1394308630967202161" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898699640103183" data-bin="http://file.ewt360.com/file/1397898699640119953" data-id="7699" />的加速度是<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397902101254218485?vh=-8" alt="mathML" data-id="721090" />，后<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397898733999857869" data-fileid="1394308630967202163" data-type="mathType" data-wmf="http://file.ewt360.com/file/1397898699640103184" data-bin="http://file.ewt360.com/file/1397898699640119954" data-id="87042" />的加速度是<img class="Wirisformula" role="math" src="http://file.ewt360.com/file/1397902161383760121?vh=-8" alt="mathML" data-id="721091" />．故D正确．</span><br /><span style="font-family: 宋体, SimSun;"><span class="mst-text-indent" contenteditable="false">&nbsp;</span>故选：AD．</span></div><br/>
省流:[['A', 'D']]<br/>
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