Advertisements
Advertisements
प्रश्न
What do you understand by the kinetic energy of a body?
Advertisements
उत्तर
Kinetic energy is the energy that a body possesses because of its motion. It is directly proportional to the mass and the square of the velocity of the moving body.
K.E = `1/2 m v^2`
APPEARS IN
संबंधित प्रश्न
What is the kinetic energy of an object?
The kinetic energy of an object of mass m moving with a velocity of 5 m s−1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
An object of mass, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
State two factors on which the kinetic energy of a moving body depends.
A ball of mass M is moving with a speed v. What is its kinetic energy?
A truck weighing 1000 kgf changes its speed from 36 km h-1 to 72 km h-1 in 2 minutes. Calculate:
- the work done by the engine and
- its power (g = 10 m s-2)
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
By how much will the kinetic energy of a body increase if its speed is doubled?
If the speed of a body is halved, what will be the change in its kinetic energy?
How fast should a man of 50 kg run so that his kinetic energy be 625 J?
What is the kinetic energy of a body of mass 1 kg moving with a speed of 2 m/s?
How does the kinetic energy of a moving body depend on its (i) speed, and (ii) mass?
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
Two objects having equal masses are moving with uniform velocities of 2 m/s and 6 m/s respectively. Calculate the ratio of their kinetic energies.
A horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
Which of the following does not posses the ability to do work not because of motion?
Explain the difference between potential energy and kinetic energy.
What are the uses of mechanical energy?
