Question

in projectile motion, power of gravitional force is:
a) is constant battle) is negative for first half, zero at topmost point and positive for rest half c) varies linearly with time d) is positive for complete path..... explain the answer from given option

Answer 1

a) is the correct answer. Actually it varies with height but the difference is negligible(tending to zero). B.) Cannot be the answer because if Gravitational force is zero it would fly away from the top most point. C.) Gravitational Force is independent of time. D.) Depends on the frame of reference.