试题与答案

质量为1kg的物体,以初动能120J从足够长的斜面底端冲上斜面,加速度大小为8m

题型:不定项选择

题目:

质量为1kg的物体,以初动能120J从足够长的斜面底端冲上斜面,加速度大小为8m/s2,已知斜面倾角为30°,则当物体返回到斜面底端时,动能的大小为:[ ]

A.30J    

B.70J    

C.90J    

D.120J

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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