如图所示,一个物体以速度v0冲向竖直墙壁,墙壁和物体间的弹簧被

如图所示,一个物体以速度v0冲向竖直墙壁,墙壁和物体间的弹簧被物体压缩,在此过程中以下说法正确的是              (      )                         

A.物体对弹簧做的功与弹簧的压缩量成正比

B.物体向墙壁运动相同的位移,弹力做的功不相等

C.弹力做正功,弹簧的弹性势能减小

D.弹簧的弹力做负功,弹性势能增加

答案

BD   

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