Q. A ball of mass 0.2 kg is thrown normally against a wall with a speed of $15\ ms^{- 1}$. The impulse of the force by the ball on the wall is
A) 0.35 Ns
B) 0.7 Ns
C) 7 Ns
D) 70 Ns
Explanation
(c) $\left| \widehat{\mathbf{j}} \right| = \left| \mathrm{\Delta}\ \overrightarrow{\mathbf{p}} \right| = 0.2(20 + 15)$N s = 7N s
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.