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
$$F = F_0\left(\frac{R}{R + h}\right)^2 = 72\left(\frac{R}{1.5R}\right)^2 = 72 \times \frac{4}{9} = 32\ \text{N}$$
Solution by Sreeraj P, M.Sc Physics