Question

A body attains a height equal to the radius of the
earth when projected from earth' surface. The
velocity of the body with which it was projected is
(1) √GM/R
(2) √2GM/R
(3) √5/4GM/R
(4) √3GM/R​

Answer 1

Answer:

√2GM/R

Explanation:

if you want it simple you can go by kinematics

here it is-

v²=u²-2gh

u²=2gh (∵v=0)

u²=2GMR/R²

⇒u=√2GM/R