Question

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

• A. $v/2$
• B. 2v
• C. $v/3$
• D. 3v

Answer 1

Answer: (C)

$v/3$

Answer 2

Initial momentum = $m v$

Final momentum = $3 m V$

By the law of conservation of momentum $m v = 3 m V$

∴$V = v / 3$