一个物体沿斜面下滑了一段距离,重力对物体做功100J,物体克服阻

 一个物体沿斜面下滑了一段距离,重力对物体做功100J,物体克服阻力做功30J。则下列说法正确的是

A.物体的动能增加了100J          B.物体的重力势能减少了100J

C.物体的动能增加了130J          D.物体的重力势能增加了100J

 

答案

 B

 

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