An object of mass 12 kg is at a certain height above the ground. If the potential energy of the object is 480 J,find the height at which the object is with respect to the ground. Given g = 10 ms^-2

Two girls, each of weight 400 N climb up a rope through a height of 8m. We name one of the girls as A and the other  as B. Girl A takes 20s while B takes 50s to accomplish this task. What is the power expended by each girl ?

Unit of workdone is

An object of mass 15 kg is moving with a uniform velocity of 4ms^-1.What is the kinetic energy possessed by the object?

A boy of mass 50 kg runs up staircase of 45 steps in 9 s. If the height of each step is 15 cm, find his power. Take g = 10 m s^-1

1 kilo watt =

A porter lifts a luggage of 15 kg from the ground and pats it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

A compressed spring possesses

By what factor does the kinetic energy of a particle increase if the velocity is increased by a factor of three?

1 hp is equal to