Question

A body of mass m is projected at angle with the
ground. When it is at the maximum height, then
instantaneous power by gravitational force will be
​

Answer 1

attachment and asked question are totally different. well, I am answering typed question.

your question is -> A body of mass m is projected with speed u at an angle Φ with the ground. When it is at the maximum height, then instantaneous power by gravitational force will be...

solution : a body of mass m is projected with speed u at an angle Φ with the ground.

at maximum height, velocity of particle will be , v = horizontal component of initial velocity = ucosΦ

force acting on body at maximum height, F = weight of body = mg

so, power = force applied × velocity

= mgucosΦ

hence, instantaneous power by gravitational force will be mgucosΦ