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 cliff, a small rock ia81ew8;r xy gqs da:5, ru( kqvqlm)jg7ob w2x- aropped 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 initially dropped rock, what is the speed of the ball relative to the r vw,jr q -m )bq5xgl2ua(k7:oaock?
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
| 
