A particle of mass `m` moving with velocity `v` strikes a stationary particle of mass `2 m` and sticks to it. The speed of the system will be.

Options

A. v//2
B. 2 v
C. v//3
D. 3 v

Answer

C

Explanation

( c) Initial momentum `= mv`
Final momentum `= 3 mV`
By the law of conservation of momentum
`mv = 3mV`
:. `V = v//3`.
.