Question

A body is projected vertically up from earth reaches a height equal to earth’s radius before returning to earth. The power exerted by the gravitational force is greatest 1) at the highest position of the body 2) at the instant just before the body hits the earth 3) it remain constant all through 4) at the instant just after the body is projected

Answer 1

Answer:

Explanation:

Power = f.v =FvcosФ

at the instant just before the body hits the earth, F is directed down : V is directed down

So power will be maximum