试题与答案

有关运动的合成,下列说法正确的是( ) A.合运动速度一定大于分运动的速度 B.

题型:选择题

题目:

有关运动的合成,下列说法正确的是(  )

A.合运动速度一定大于分运动的速度

B.合运动的时间与两个分运动的时间是相等的

C.合速度的方向就是物体的受力方向

D.由两个分速度的大小就可以确定合速度的大小和方向

答案:

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