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src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmi%3Eh%3C%2Fmi%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmn%3E.%3C%2Fmn%3E%3Cmn%3E8%3C%2Fmn%3E%3Cmtext%3Em%3C%2Fmtext%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">處以<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmsub%3E%3Cmrow%3E%3Cmi%3Ev%3C%2Fmi%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E0%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsub%3E%3Cmo%3E%3D%3C%2Fmo%3E%3Cmn%3E4%3C%2Fmn%3E%3Cmsqrt%3E%3Cmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsqrt%3E%3Cmtext%3Em%3C%2Fmtext%3E%3Cmn%3E%2F%3C%2Fmn%3E%3Cmtext%3Es%3C%2Fmtext%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">的初速度水平拋出，之后恰好能從斜面頂端沿斜面方向下滑至地面，已知小球在斜面上下滑的時間為2s，斜面長18m。（g取<img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmn%3E1%3C%2Fmn%3E%3Cmn%3E0%3C%2Fmn%3E%3Cmtext%3Em%3C%2Fmtext%3E%3Cmn%3E%2F%3C%2Fmn%3E%3Cmsup%3E%3Cmrow%3E%3Cmtext%3Es%3C%2Fmtext%3E%3C%2Fmrow%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmrow%3E%3C%2Fmsup%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;">）求：<p><img width="246" height="165" src="http://tikupic.21cnjy.com/2022/03/08/66/21/6621af90dbf2a715eeb3ec00a444b50c_268x180.png" style="max-width:100%;"></p> </h1> <ol class="q-bd-list"> <li> <div id="v5xbrpn" class="question-block"> <div id="ldnv7lv" class="q-mc"> <div id="xzh7h79" class="q-tit"> （1）小球下落h時的豎直速度； </div> </div> </div> <li> <li> <div id="nrx5xjj" class="question-block"> <div id="5tjjnz1" class="q-mc"> <div id="nl1rxn7" class="q-tit"> （2）小球落在斜面頂端的速度； </div> </div> </div> <li> <li> <div id="5dbvblt" class="question-block"> <div id="5lt97tp" class="q-mc"> <div id="zzxr5t9" class="q-tit"> 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