Find the height over the earth's surface at which the weight of a body becomes half of its value t the surface.

Answer

A, B, D

Explanation

Let the height be h
`:. (1/2)(GM)/R^2=(GM)/((R+h)^2)`
or `2R^2=(R+h)^2`
or `sqrt2R=R+h`
`h=(sqrt2-1)R`