Q. A body of mass ‘M’ collides against a wall with a velocity $v$ and retraces its path with the same speed. The change in momentum is (take initial direction of velocity as positive)
A) Zero
B) $2Mv$
C) $Mv$
D) $- 2\ Mv$
Explanation
(d) Change in momentum $= m{\overrightarrow{v}}_{2} - m{\overrightarrow{v}}_{1} = - mv - mv = - 2mv$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.