Q. 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) $3v$
Explanation
(c) Initial momentum $= mv$
Final momentum $= 3mV$
By the law of conservation of momentum $mv = 3mV$
$\therefore V = v/3$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.