Q. A body weighs 72 N on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?
A) 32 N
B) 30 N
C) 24 N
D) 48 N
Explanation
[Solution] $F = 72 \times \left(\frac{R}{1.5R}\right)^2 = 72 \times \frac{4}{9} = 32$ N. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.