Q. A ball of mass $m$ moving with velocity $V$, makes a head on elastic collision with a ball of the same mass moving with velocity $2V$ towards it. Taking direction of $V$ as positive velocities of the two balls after collision are
A) $- V$ and $2V$
B) $2V$ and $–V$
C) $V$ and $- 2V$
D) $- 2V$ and $V$
Explanation
(d) Due to elastic collision of bodies having equal mass, their velocities get interchanged
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.