Q. A body of mass $m$ moving with a constant velocity $v$ hits another body of the same mass moving with the same velocity $v$ but in the opposite direction and sticks to it. The velocity of the compound body after collision is
A) $v$
B) $2v$
C) Zero
D) $v/2$
Explanation
(c) Initial momentum of the system $= mv - mv = 0$
As body sticks together $\therefore$ final momentum $= 2mV$
By conservation of momentum $2mV = 0\therefore V = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.