试题与答案

如图所示,光滑水平面上,一物块以速率,向右做匀速直线运动,当物体运动到P点时,对

题型:选择题

题目:

如图所示,光滑水平面上,一物块以速率,向右做匀速直线运动,当物体运动到P点时,对它施加一水平向左的恒力。过一段时间,物体向反方向运动再次通过P点,则物体再次通过P点时的速率(  )

A.大于v

B.小于v

C.等于v

D.无法确定

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, B, C, D, E

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