Physics Unit6: Work and Energy (id: e2fa8f5b4)

本题目来源于试卷: Physics Unit6: Work and Energy，类别为 通用国际物理

[单选题]
An object hits a waldl s;pz*ncj+er(+i t6l and bounces back with half of its originag)ibi:ztrh5f m(s i7p,x8xs, l speed. What is the ratzmgx,b,)x57r s i( :f hpiis8tio of the final kinetic energy to the initial kinetic energy?

A. \frac{1}{2} \;
B. 1/4
C. 2
D. 4


参考答案:  B


本题详细解析: 暂无

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