本题目来源于试卷: Impulse and momentum，类别为 美国物理杯赛(Physics Bowl)
[单选题]
10.33: A rubber ball of masfu8)v ljg gn.uao+aaf1y n-l89 x wc00s luu.d.xe2cgd+9xvk: 51 z hfu2.0 kg falling straight downward hits the ground with d5 fud9.zv2 k :x .elghu1xuc+a speed of 0.90 m/s and then rebounds straight upward with a speed of 0.60 m/s. The collision time of the ball with the ground is 0.25 s. Treat g = 10 N/kg.
What is the magnitude of the average force (in units of Newtons) exerted by the ground on the ball while they are in contact?
A. 2.4
B. 12.0
C. 20.0
D. 26.0
E. 32.0
参考答案: E
本题详细解析:
暂无
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