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Question

Question: A stone of mass m is thrown from earth’s surface at an angle a to the horizontal with an initial vel...

A stone of mass m is thrown from earth’s surface at an angle a to the horizontal with an initial velocity v0. Ignoring the air drag, the power developed by gravity force t second after the beginning of motion is –

A

mg(gt – v0 sin a)

B

mgv0 sin a . t

C

mg(g – v sin a. t)

D

Zero

Answer

mg(gt – v0 sin a)

Explanation

Solution

P = F vy = mg (V0sina – gt)