Q. A body of mass $0.5\ kg$ is projected under gravity with a speed of $98\ m/s$ at an angle of $30{^\circ}$ with the horizontal. The change in momentum (in magnitude) of the body is
A) $24.5\ N - s$
B) $49.0\ N - s$
C) $98.0\ N - s$
D) $50.0\ N - s$
Explanation
(b) Change in momentum $= 2mu\sin\theta$
$= 2 \times 0.5 \times 98 \times \sin 30 = 49\ N$-$s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.