$A$ body of mass $m$ moving with velocity $v$ collides with another body of mass $nm$ moving in the same direction with velocity $kv$. If the first body comes to rest after the collision,what is the velocity of the second body?
- A$\frac{nv}{1 + nk}$
- B$\frac{nv}{1 - nk}$
- C$\frac{(1 - nk)v}{n}$
- D$\frac{(1 + nk)v}{n}$
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