本题目来源于试卷: Work Energy and Power，类别为 美国物理杯赛(Physics Bowl)
[单选题]
02.48: An object of mass yv by9-q )hu3; 6+nsqz,nxymk-(xl-*n y5 5o/safdz fet;geaM is dropped from aheightH above the ground. The object crashes into some soft earth and comes to rest by compressing the earth a distance of H/2. Assuming that air resistance is negligible, what is the magnitude of the average constant force exerted by the gzx-/(l5a;efs*- o5an ftyde ground on the object while coming to rest?
A. $0$
B. $2/3Mg$
C. $Mg$
D. $2Mg$
E. $3Mg$
参考答案: E
本题详细解析:
暂无
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