What are the uses of mechanical energy?

Short/Brief Note

In hydroelectric plants, the kinetic energy of water is converted into electrical energy.
Windmills convert the kinetic energy of winds into electrical energy.
The mechanical energy of the hammer is used to apply a force to a nail.
Mechanical energy can bring a moving body to rest and make a body at rest move.

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Chapter 3 Energy
Evaluation | Q VI. 3. | Page 129

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?

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.

Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity

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A rolling ball

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