本题目来源于试卷: Physics Unit6: Work and Energy，类别为 国际高中通用物理
[单选题]
A ball falls from the top of a buildingy/xi.q)nvbv ;6j u n.l, through the airevq-a7c jm)esu .9s- jzy 82isr+j6 mr (air friction is present), to the ground below. How does the2jia-+em)ryrj7cj.mzu vs-s6 9 esq8 kinetic energy (K) just before striking the ground compare to the potential energy (U) at the top of the building?
A. K is equal to U.
B. K is greater than U.
C. K is less than U.
D. It is impossible to tell.
参考答案: C
本题详细解析:
暂无
| 
