本题目来源于试卷: Physics Bowl by Topic 3: Kinematics - part II Uniformly Accelerated Motion，类别为 美国物理杯赛(Physics Bowl)
[单选题]
13.33: At the top of a high cll+iq9in 0)uy7tm 3 tjfiff, a small ra9t6vm j;u5 ckuhv79e f42qijock is dropped from rest. A ball is launched straight downward with an initial speed of 36 m/s at a time 2.10 s after the rock was dropped. When the ball has fallen 28.0 m further than the initi 2umvkq956 ;97juih vt4eacjfally dropped rock, what is the speed of the ball relative to the rock?
A. 15.0 m/s
B. 16.0 m/s
C. 20.0 m/s
D. 21.0 m/s
E. 36.0 m/s
参考答案: A
本题详细解析:
暂无
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