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<div id="ril44o4" class="q-mc"> <h1 class="q-tit"> 1. <a href="/paper/view-5189894.shtml" class="ques-origin a-pointer" target="_blank"> (2023高一下·滿洲里期末) </a> 質(zhì)量為0.1kg的金屬塊從距水平地面50m高處由靜止開始下落，不計空氣阻力，g取10m/s<sup>2</sup> ，則該金屬塊所受重力在從初始時刻算起的第2s內(nèi)所做的功和第2s末的功率分別為（　?。? </h1> <div id="bcdjnue" class="exam-s"> <span id="fpwddc9" class="op-item"><span id="twc9skk" class="op-item-nut">A . </span><span id="dng9lkd" class="op-item-meat">20J，20W</span></span> <span id="lwzaxeb" class="op-item"><span id="b9n4vt9" class="op-item-nut">B . </span><span id="qo99fao" class="op-item-meat">15J，20W</span></span> <span id="ey5fbb9" class="op-item"><span id="ojiar99" class="op-item-nut">C . </span><span id="qs4t44q" class="op-item-meat">20J，10W</span></span> <span id="4drxaj4" class="op-item"><span id="4wcvfhg" class="op-item-nut">D . </span><span id="99yyaba" class="op-item-meat">15J，15W</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div> 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