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質(zhì)量為<em>m</em>的籃球從某一高處從靜止下落，經(jīng)過(guò)時(shí)間<em>t</em><sub>1</sub>與地面接觸，經(jīng)過(guò)時(shí)間<em>t</em><sub>2</sub>彈離地面，經(jīng)過(guò)時(shí)間<em>t</em><sub>3</sub>達(dá)到最高點(diǎn)。重力加速度為<em>g</em> ，忽略空氣阻力。地面對(duì)籃球作用力沖量大小為（　?。? </h1> <div id="zicchra" class="exam-s"> <span id="5nlm7f1" class="op-item"><span id="d2oo99s" class="op-item-nut">A . </span><span id="qna5s9f" class="op-item-meat"><em>mgt</em><sub>1</sub>＋<em>mgt</em><sub>2</sub>＋<em>mgt</em><sub>3</sub></span></span> <span id="pezlu7b" class="op-item"><span id="67bbuur" class="op-item-nut">B . </span><span id="kqaygvm" class="op-item-meat"><em>mgt</em><sub>1</sub>＋<em>mgt</em><sub>2</sub>-<em>mgt</em><sub>3</sub></span></span> <span id="a2r4g0m" class="op-item"><span id="lpbaw2n" class="op-item-nut">C . </span><span id="12t3gys" class="op-item-meat"><em>mgt</em><sub>1</sub>＋<em>mgt</em><sub>2</sub></span></span> <span id="jadbjzq" class="op-item"><span id="kql38js" class="op-item-nut">D . </span><span id="4676epg" 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