Q. The work done to raise a mass m from the surface of the earth to a height h, which is equal to the radius of the earth, is :
A) mgR
B) 2 mgR
C) $\frac{1}{2}$ mgR
D) $\frac{3}{2}$ mgR
Explanation
[Solution] $W = \frac{GMm}{R} - \frac{GMm}{2R} = \frac{mgR}{2}$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.