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प्रश्न
What is the kinetic energy of an object?
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उत्तर
Kinetic energy is the energy that an object has because of its motion. The kinetic energy of an item moving at a specific velocity equals the effort required to attain that velocity.
The energy an object possesses due to its motion is called kinetic energy.
Kinetic energy (ke) = `1/2 mv^2`
Where m = mass of the object
v = velocity of the object
संबंधित प्रश्न
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Certain force acting on a 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force.
Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy?
Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.
A body of mass 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find:
- the initial kinetic energy, and
- the final kinetic energy.
How fast should a man of 50 kg run so that his kinetic energy be 625 J?
A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
Find out the form of energy possessed by the following thing.
A rolling ball
Explain the types of mechanical energy.
A ball of mass 0.5 kg slows down from a speed of 10 m s−1 to that of 6 m s−1. Calculate the change in the kinetic energy of the ball.
