Q. A body of mass $M$ moving with a speed $u$ has a head-on collision with a body of mass $m$ originally at rest. If $M > > m$, the speed of the body of mass $m$ after collision will be nearly
A) $\frac{um}{M}$
B) $\frac{uM}{m}$
C) $\frac{u}{2}$
D) $2u$
Explanation
(d) When a heavy body with velocity $u$ collides with a lighter body at rest, then the heavier body remains moving in the same direction with almost same velocity. The lighter body moves in the same direction with a nearly velocity of $2u$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.