A man weight 80 kg on earth surface. The height above ground where he will weight 40kg is (radius of earth r)

A man weight 80 kg on earth surface. The height above ground where he

1.	A man weight 80 kg on earth surface. The height above ground where he will weight 40kg is (radius of earth r)
Answer» `0.31` TIMES R `0.414` times r `0.51` times r `0.61` times r Answer :B