如图9所示,两个质量相同的物体A和B,在同一高度处,A物体自由下

如图9所示,两个质量相同的物体A和B,在同一高度处,A物体自由下落,B物体沿光滑斜面下滑,则它们到达地面时(空气阻力不计)
A.速度相同,动能相同
B.B物体的速率大,动能也大
C.A、B两物体在运动过程中机械能都守恒
D.B物体重力所做的功比A物体重力所做的功多

 

答案

C

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