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【多选题】
认为自由落体运动应该是最简单的变速运动,即它的速度是均匀变化的,速度均匀变化意味着( )A.
速度与时间成正比
B.
速度与位移成正比
C.
速度与时间的二次方成正比
D.
位移与时间的二次方成正比
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