1 Joule =

A body at rest is acted upon by a force F such that it acquires a speed while moving with an acceleration a. The work done by the force on the body is

A man exerts a force of 200N in pulling a cart at a constant speed of 16ms^-1.  Then the power spent by man is

A crane pulls up a car of mass 500kg to a vertical height of 4m.  Then the work done by the crane is __________ 

If the power of a motor is 40 kW, at what speed can it raise a load of 20,000 N?

When a stone is thrown vertically upwards to a height and then it falls freely and reaches its initial position,the net work done by the gravitational force is

 One horse power is equal to

 When a body moves in a circular path how much work is done by the body?

A boy weighing 350 N runs up a flight of 30 steps, each 20 cm high in 1 minute.   Then the work done is

 A boy of mass 40 kg runs up a flight of 50 steps, each 10 cm high in 4 seconds. The work done by the boy is 1960 J. Then the power developed is      ( g = 9.8 ms^-2)