Work and Energy...

Kinetic energy and momentum of a body are 3000 J and 60 kg ms^{- 1} respectively. What is the mass of the body?

How much work is needed to be done on an object of mass 3 kg to give it a momentum of 900 kg m/s?

An object of mass `m` has a kinetic energy `K`. What will be its new kinetic energy if its momentum is halved?

A ball of mass 0.1 kg is thrown vertically upwards with an initial speed of 20 ms^-1. The maximum height reached by the ball is

A simple pendulum while oscillating rises to a maximum vertical height of 20 cm from its rest position. What is the velocity of bob at its resting position if its mass is 600g?
(Take g = 10 m/s²)

Which of the following is correct?

What is the commercial unit of electrical energy?

An engine generates 20 KW of power. How much time will it take to lift a mass of 500 kg to a height of 40 m?
(Take g = 10 m/s²)

The power delivered to the turbine by a water fall pouring down at the rate of 100 kg per second on the blades of turbine is 100 KW. What is the height of the fall?

An electric motor exerts a force of 24 N on a cable and pulls it by a distance of 15 m in one minute. What is the power supplied by the motor?