Question

Write an expression for the kinetic energy of an object.

Answer 1

The kinetic energy of an object is the energy possessed by it while moving. The stationary object does not possess kinetic energy. The SI unit of kinetic energy is Joule. The CGS unit of energy is known as erg. Energy can also be expressed in calories.

Complete step by step answer:
The tendency of the object to do work is known as energy. So, the energy of the object is its capacity to do work. The energy is the conserved quantity. So, the total energy in the universe is constant.
The potential energy is the energy of the stationary object. The object at rest possesses potential energy.
The kinetic energy is the energy of the moving object. The energy possessed by the moving object is known as the kinetic energy.
Consider an object having mass m and the object is moving with the speed of v. The kinetic energy of the object is given by,
$\Rightarrow \text{KE=}\dfrac{1}{2}m{{v}^{2}}$
Where, m is the mass of the object and v is the speed of the object.

Note:
The energy is the conserved quantity. It means that the energy can neither be created nor can be destroyed. It can be transferred from one form to another form. This property of energy is also known as the law of conservation of energy.