Q 11-07-012NEETNEET 2020Top questionEasy
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 ?
Answer: (B) $32$ N
Concept. $F = F_0\left(\dfrac{R}{R + h}\right)^2$.
Step 1. Substitute. $72 \times \dfrac49 = 32$ N.
Answer. $32$ N (Option B).
Solution by Sreeraj P, M.Sc Physics