Q. Consider elastic collision of a particle of mass $m$ moving with a velocity $u$ with another particle of the same mass at rest. After the collision the projectile and the struck particle move in directions making angles $\theta_{1}$ and $\theta_{2}$ respectively with the initial direction of motion. The sum of the angles $\theta_{1} + \theta_{2}$, is

A) $45{^\circ}$
B) $90{^\circ}$
C) $135{^\circ}$
D) $180{^\circ}$
Explanation

(b) If the masses are equal and target is at rest and after collision both masses moves in different direction. Then angle between direction of velocity will be $90{^\circ}$, if collision is elastic

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.