Question

At which height from the surface of the Earth, The acceleration due to gravity is the same as at a depth 160 km below the surface of Earth. Radius of Earth is 6400 km

Answer 1

$g$ at depth$=g$ at height

$g(1-\frac{d}{R})=g(1-\frac{2h}{R})$

$⟹h=\frac{d}{2}=80km$