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<p>如圖所示，A、B兩小球從相同高度同時(shí)水平拋出，經(jīng)過時(shí)間t在空中相遇，若兩球的拋出速度都變?yōu)樵瓉淼?倍，則兩球從拋出到相遇經(jīng)過的時(shí)間為（　?。?/p><p><img width="213" height="130" src="http://tikupic.21cnjy.com/49/d5/49d5bfce813abaaf48541fc9a83bd227.png" style="max-width:100%;"></p> </h1> <div id="7jcutth" class="exam-s"> <span id="agpyvvc" class="op-item"><span id="h8bnbln" class="op-item-nut">A . </span><span id="xr3xtbp" class="op-item-meat">t</span></span> <span id="6w0a6f3" class="op-item"><span id="adpx3zu" class="op-item-nut">B . </span><span id="j7nme9a" class="op-item-meat"><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%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmfrac%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> t</span></span> <span id="dp2pvni" class="op-item"><span id="obdve9n" class="op-item-nut">C . </span><span 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