试题与答案

人骑自行车上坡,坡长200 m,坡高10 m。人和车的质量共100 kg,若在坡

题型:选择题

题目:

人骑自行车上坡,坡长200 m,坡高10 m。人和车的质量共100 kg,若在坡底时自行车的速度为8 m/s,到达坡顶时速度为2 m/s,g取10 m/s2。则上坡过程中重力做功的平均功率为

A.5000W

B.1000W

C.500W

D.250W

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

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