A body weighs 63 N on the surface of the Earth . What is the gravitational force on it due to the Earth , at a height equal to half the radius of the Earth ? (Given that the radius of Earth = 6400 km).

Explanation

We know that , `g'=g(1+h/R)^(-2),h=R/2and h/R=1/2`
`:. g'=(4/9)g`
Gravitational force mg' `=(4/9)mg =4/9xx63=28N.`