Force, Work, En...

A body starts from rest and acquires a velocity V in time 'T'. The work done on the body in time't' will be proportional to

Which of the following statements is correct?

A man of mass 60 kg climbs up a 20 m long stair case to reach the top of a building, which is 10 m high. What is work done by him?

A car running at 25 km/h can be brought to rest by applying brakes at a distance of 0.5 m. If the car is running at 75 km/h, how far will it go before coming to rest, if the braking force remains the same?

A ball falls from a height of a \(20 {~m}\) and then bounces back up to \(10 {~m}\) height. The loss of energy is:

A truck is 8 times heavier than a car and is moving at half the speed of the car. The amount of work done required to stop the truck as compared to the car is:

Which of the following remains constant for an isolated system?

Which of the following is the correct expression for work 'w', if is the force and  is the displacement and angle between  and  is ?

An engine pumps out 40 kg of water in one second. The water comes out vertically upwards with a velocity of 3ms^-1. What is the power of engine in kilowatt?

A body of mass M is lowered with acceleration g/2 with the help of a string and through a distance l. What is the work done by the string?

A girl of weight 400 N climbs up a rope through a height of 8 m. The girl takes 20 s to accomplish this task. What is the power expended by the girl?

A body is under the action of two equal and opposite forces, each of 3N and is displaced by 2 m. Which of the following is the value of work done by the body?

Which of the following increases with rise in ball that is projected upwards?

A bullet is fired into a block. Its velocity decreases by 50%, when it penetrates through 9 cm. What will be the total distance penetrated by the bullet?

The force of attraction between two objects is called the ______.

The magnitude of the momentum of a particle is increased by 100%. If the initial kinetic energy is k, what will be the final kinetic energy?

A simple pendulum is vibrating in an evacuated chamber. It will oscillate with

What is the power developed by an engine in lifting water of 3000 litre from a well 20 m deep in one minute?(1 litre water = 1000 Kg; g = 10 m/s²)

A bomb of 12 kg explodes into two pieces of mass 4 kg and 8 kg. The velocity of 8 kg mass is 6 m/s.
What is the kinetic energy of the other mass?

What is the kinetic energy, if the momentum of a body is doubled?

What is the nature of graph of potential energy of a simple pendulum and its displacement from the mean position?

What is the value of gravitation potential energy of the body of mass 2 kg, which is projected vertically upwards with a speed of 3 m/s?

If we throw a body upwards with velocity of 4 ms^-1, at what height does its kinetic energy reduce to half of its initial value?

If the mass of the body is halved and its speed is doubled, what happens to the kinetic energy of the body?

Two bodies A and B having masses m and M respectively possess the same momenta. If M > m, and E_A and E_B are their kinetic energies, which of the following is true?