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 M is dr1 e qntox 3 i4nojn57vagr0k85opped from ahqg+9 :be. ztcifnfjtlz)yi2b6 )l2 h/eightH above the ground. The object crashes into some soft earth and comes to rest by compress:)i.l lz6tjc n92i zf2f e/b)yhbt q+ging 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 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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