Q. A ball of mass $m$ moves with speed $v$ and it strikes normally with a wall and reflected back normally, if its time of contact with wall is$\ t$ then find force exerted by ball on wall
A) $\frac{2mv}{t}$
B) $\frac{mv}{l}$
C) $mvt$
D) $\frac{mv}{2t}$
Explanation
(a) Force exerted by ball on wall
= rate of change in momentum of ball
$= \frac{mv - ( - mv)}{t} = \frac{2mv}{t}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.