A particle,rest mass m,moves with a certain speed.After tota

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A particle,rest mass m,moves with a certain speed.After totally inelastic collision with an identical particle at rest,a new particle,with rest mass M,is produced.The kinetic energy of original particle is
一个粒子的静质量是m,以一定的速度运动。它和另一个完全相同的静止粒子发生了完全非弹性碰撞，产6生了一个质量为M的新粒子，那么原来粒子的动能是多少？
A.(M^2-4m^2)/(2m)*c^2 B.(4m^2-M^2)/(2m)*c^2 C.(2m^2-M^2)/m*c^2 D.(M^2-2m^2)/m*c^2

碰撞后部分动能转化为质量,该部分能量e=(M-2m)c^2 ,其中c为光速
1/2 mv^2 - e =1/2Mv'^2,其中v’是碰撞后的速度
mv=Mv' （动量守恒）
结合上述两式求得粒子原始动能为：1/2 mv^2=e/(1-m/M)=(M-2m)c^2 / (1-m/M)
再问：选择题的选项里没有这个答案。。。
再答：选择题呀，那你不把选项贴出来？也好有个判断的依据。

Consider a free particle of mass m in one dimension. 翻译：A neutron is a nuclear particle with an atomic mass of 2. In Fig.13-41,a particle of mass m1 = 0.24 kg is a distance d 问一道量子力学的题Consider a particle of mass in the state |n> of a b A mass m is attached to a massless spring with a force const with a high speed 还是at a high speed? a mass An object with an initial velocity of 4m/s moves along a str A giant rolls a bowling ball with a uniform speed of 30 m/s A baseball is hit with a speed of 28.0m/s An ashtray slides across a table with a speed of 0.6m/s and suppose a roller coaster passes point 1 with a speed of 1.7m