Assuming the earth to be a sphere of uniform mass density, how much would a body weigh half way down to the centre of the earth if it weighed 250 N on the surface ?

Explanation

wt. of body at a depth `"d" = "mg"^1`
`= m xx g (1- (d)/( R))`
`= 250 (1- (R//2)/( R))`
`=125"N"`