试题与答案

如图所示,在一个桌面上方有三个金属小球a、b、c,离桌面高度分别为h1:h2:h

题型:选择题

题目:

如图所示,在一个桌面上方有三个金属小球a、b、c,离桌面高度分别为h1h2h3=3:2:1.若先后顺次释放a、b、c,三球刚好同时落到桌面上,不计空气阻力,则(    )

A.三者到达桌面时的速度之比是::1

B.三者运动时间之比为3:2:1

C.b与a开始下落的时间差小于c与b开始下落的时间差

D.三个小球运动的加速度与小球受到的重力成正比,与质量成反比

答案:

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