Q. A body of mass $10\ kg$ is dropped to the ground from a height of $10\ metres$. The work done by the gravitational force is $(g = 9.8\ m/s^{2})$
A) $- 490\ joules$
B) $+ 490\ joules$
C) $- 980\ joules$
D) $+ 980\ joules$
Explanation
(d) As the body moves in the direction of force therefore work done by gravitational force will be positive
$W = Fs = mgh = 10 \times 9.8 \times 10 = 980\ J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.