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class="ques-origin a-pointer" target="_blank"> (2022·韶關(guān)模擬) </a> 某冰壺隊(duì)為了迎接冬奧會(huì)，積極開展訓(xùn)練。某次訓(xùn)練中使用的紅色冰壺A和藍(lán)色冰壺B的質(zhì)量均為20kg，初始時(shí)兩冰壺之間的距離s=7.5m，運(yùn)動(dòng)員以v<sub>0</sub>=2m/s的初速度將紅色冰壺A水平擲出后，與靜止的藍(lán)色冰壺B碰撞，碰后紅色冰壺A的速度大小變?yōu)関A=0.2m/s，方向不變，碰撞時(shí)間極短。已知兩冰壺與冰面間的動(dòng)摩擦因數(shù)均為μ=0.02，重力加速度g=10m/s<sup>2</sup>。求：<p><img width="397" height="87" src="http://tikupic.21cnjy.com/2022/06/15/b4/d4/b4d45cabe9619a3ce021fa79c39bcab4.png" style="max-width:100%;"></p> </h1> <ol class="q-bd-list"> <li> <div id="9jzjd7d" class="question-block"> <div id="hvlgmsj" class="q-mc"> <div id="s4jsvvk" class="q-tit"> （1）紅色冰壺A從開始運(yùn)動(dòng)到停下所需的時(shí)間； </div> </div> </div> <li> <li> <div id="l9zoawx" class="question-block"> <div id="j6uewxc" class="q-mc"> <div id="zoh196s" class="q-tit"> （2）兩冰壺碰撞過程中損失的機(jī)械能。 </div> </div> </div> <li> </ol> </div> </div> </li> </ul> <div style="height:20px;background-color: #fff;margin-top:1px"></div>  <div class="6ekdtdz" 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