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<span>當(dāng)前位置：</span>   <a href="/question?tree_type=category&xd=3&chid=6" class="pointer">高中物理</a> <span>/</span> <a href="javascript:;">單選題</a> </div> <div id="jxih7tb" class="m-wrap g-cw cfx"> <div id="wldsqb7" class="w fl"> <div id="dzaopii" class="g-mn2"> <ul id="J_question_detail" > <li> <div id="sh7qxb0" class="question-block"> <div id="4vq8yjw" class="q-mc"> <h1 class="q-tit"> 1. <a href="javascript:;" class="ques-origin " target="_self"> (2017高二上·永年開學(xué)考) </a> 如圖所示，某段滑雪雪道傾角為30°，總質(zhì)量為m（包括雪具在內(nèi)）的滑雪運(yùn)動(dòng)員從距底端高為h處的雪道上由靜止開始勻加速下滑，加速度為 <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%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> g．在他從上向下滑到底端的過程中，下列說法正確的是（　?。?p><img width="101" height="73" src="http://tikupic.21cnjy.com/dc/bb/dcbb401f2a43358fac74e1aa8676e2b6.png" style="max-width:100%;"></p> </h1> <div id="2ic2pbe" class="exam-s"> <span id="xtrxhan" class="op-item"><span id="h9r9g7j" class="op-item-nut">A . </span><span id="siw1bfi" class="op-item-meat">運(yùn)動(dòng)員減少的重力勢(shì)能全部轉(zhuǎn)化為動(dòng)能</span></span> <span id="vcoly12" class="op-item"><span id="6hbejk4" class="op-item-nut">B . </span><span id="krnd889" class="op-item-meat">運(yùn)動(dòng)員獲得的動(dòng)能為 <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%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> mgh</span></span> <span id="9804y8l" class="op-item"><span id="u3mgssl" class="op-item-nut">C . </span><span id="etml0gh" class="op-item-meat">運(yùn)動(dòng)員克服摩擦力做功為 <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%3Cmfrac%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> mgh</span></span> <span id="7dy8t2x" class="op-item"><span id="pfy7hwl" class="op-item-nut">D . </span><span id="4fazq9b" class="op-item-meat">下滑過程中系統(tǒng)減少的機(jī)械能為 <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%3Cmfrac%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> mgh</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="cjartk7" id="J_ConnectQuestionsdBox"> </div> </div> </div> <div id="906hxyk" class="g-sd2">  <div style="background:#fff;padding:20px 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