Q. A body of mass $2\ kg$ is projected at $20\ m/s$ at an angle of $60{^\circ}$ above the horizontal. Power on the block due to the gravitational force at its highest point is
A) $200\ W$
B) $100\sqrt{3}\ W$
C) $50\ W$
D) Zero
Explanation
(d) $P = v\cos\theta = mg\ v\cos{90{^\circ}} = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.