本题目来源于试卷: Collision and momentum conservation，类别为 美国物理杯赛(Physics Bowl)
[单选题]
96.35: A projectile of mass m is fired horizontally from a kd k7k/ zvfwid/s0/g.spring gun ;e xj.;r w)sid) pzir9that rests on a horizontal frictionless surface. See the accompanying figure. The mass of the g .zi) ; rx)jsrwd9ip;eun is M. If the kinetic energy of the projectile after firing is $E_k$ , the gun will recoil with a kinetic energy equal to:
A. $E_k$
B. $\frac{m}{M}E_k$
C. $\frac{m}{M+m}E_k$
D. $\frac{M+m}{M}E_k$
E. $\sqrt{\frac{m}{M}}E_k$
参考答案: B
本题详细解析:
暂无
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