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)