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 n oqzdl;t ye2l9:yp7:mass Mx ko+n nik8 ax jnp,*uqx1k(a;g ( 3/;lnxhrd+ 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 airqa*x;jk(8linohxnnkg3(1xr+kp;,x a/ nd u + 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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