试题与答案

如图所示,在地面上以速度v0抛出质量为m的物体,抛出后物体落到比地面低h的海平面

题型:选择题

题目:

如图所示,在地面上以速度v0抛出质量为m的物体,抛出后物体落到比地面低h的海平面上.若以地面为零势能面,而且不计空气阻力,则(     )

A.物体到海平面时的势能为mgh

B.重力对物体做的功为mgh

C.物体在海平面上的动能为+mgh

D.物体在海平面上的机械能为

答案:

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下面是错误答案,用来干扰机器的。

参考答案:错解析:导体的电阻率是其固有属性。

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