如图所示,物体A的质量是B的2倍,中间有一压缩弹簧,放在光滑水平

如图所示,物体A的质量是B的2倍,中间有一压缩弹簧,放在光滑水平面上,由静止同时放开两物体后一小段时间内(    )

A.A的速度是B的一半                        B.A的动量大于B的动量

C.A受的力大于B受的力                     D.总动量为零

答案

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解析:mAvA=mBvB,即2mvA=mvB,vB=2vA.总动量守恒,恒为零.

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