如图所示,铅球从出手到将要落地的过程中,下列说法正确的是不计空气阻力 A.铅球由a→b时,动能逐渐增大 b.铅球在b点的机械能大于a Template


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tomski如图所示,铅球从出手到将要落地的过程中,下列说法正确的是不计空气阻力 a.铅球由a→b时,动能逐渐增大 b.铅球在b点的机械能大于a coloring