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]
06.20: A boy jumps frol/ghcy 8ni fjo0tioff:ld,) (, ; uv2km rest straigo4g4lo1oosr0 sb: 5maht upward from a flat, stationary concrete surface. The boy, of mass M, leaves the concretbs1:5o4moogar0o 4ls e surface with speed v and his center of mass rises a distance d to the highest point of the motion. How much physical work did the average normal force of contact (N) between the boy’ s feet and the concrete do on the boy?
A. $Nd$
B. $0.5Mv^{2}$
C. $0.5Nd$
D. $Mgd$
E. $0$
参考答案: E
本题详细解析:
暂无
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