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id="7g5gq75" class="w fl"> <div id="va1u6w0" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="tpkvdov" class="question-block"> <div id="oaam5r5" class="q-mc"> <h1 class="q-tit"> 1. <a href="javascript:;" class="ques-origin " target="_self"> (2017高一下·六安開學(xué)考) </a> <p>將一個質(zhì)量為1kg的小球豎直向上拋出，最終落回拋出點，運動過程中所受阻力大小恒定，方向與運動方向相反，該過程的v﹣t圖象如圖所示，g取10m/s<sup>2</sup> ，下列說法中正確的是（　?。?/p><p><img width="179" height="134" src="http://tikupic.21cnjy.com/c8/39/c83909212701592cbef94909abb10d61.png" style="max-width:100%;"></p> </h1> <div id="yzqgmcz" class="exam-s"> <span id="z3kv5aw" class="op-item"><span id="ugmxwkx" class="op-item-nut">A . </span><span id="pm3ih6n" class="op-item-meat">小球所受重力和阻力之比為4：1</span></span> <span id="lwjyy3w" class="op-item"><span id="syljftl" class="op-item-nut">B . </span><span id="p9az7rt" class="op-item-meat">小球上升過程與下落過程所用時間之比為2：3</span></span> <span id="rsfrbiu" class="op-item"><span id="ufsm5ed" class="op-item-nut">C . </span><span id="6ulm9fg" class="op-item-meat">小球落回到拋出點時的速度大小為8 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E6%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> m/s</span></span> <span id="nkfwccp" class="op-item"><span id="bydyjna" class="op-item-nut">D . </span><span id="6yq5c19" class="op-item-meat">小球下落過程中，受到向上的空氣阻力，處于超重狀態(tài)</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="u9rsjmd" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="5dyojl9" class="g-sd2">  <div style="background:#fff;padding:20px 0;margin-bottom:20px;text-align:center;"> <img src="/question/paper-qrcode?id=4511001" width="140px" height="140px" alt=""> <p style="text-align:center;margin-top: 10px">微信掃碼預(yù)覽、分享更方便</p> </div> <div id="5cxyata" class="analyize-extend 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