如下图所示,质量为3m的木板静止放在光滑的水平面上,木板左端固

如下图所示,质量为3m的木板静止放在光滑的水平面上,木板左端固定着一根轻弹簧质量为m的小木块(可视为质点)从木板右端以未知速度υ0开始沿木板向左滑行,最终弹回到木板右端刚好未从木板上滑出.若在小木块压缩弹簧的过程中,弹簧具有的最大弹性势能为Ep,小木块与木板间滑动摩擦因数大小保持不变,求:
(1)木块的未知速度υ0
(2)以木块与木板为系统,上述过程中系统损失的机械能.

答案

(1) (2)△E=2Ep

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