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Official Soldier Technical Paper: [IRO Delhi] - 2020

Option 4 : 40 Jule

option(4)

__ CONCEPT__:

**Kinetic Energy:**It is the form of energy that posses when the object is in motion.

\(K.E = \frac{1}{2}mv^2\)

Where m is the mass of the body, v is the velocity of the body

__ CALCULATION__:

Mass of the body = 200 g = 200/1000 Kg = 0.2 Kg

velocity of the body = 20 m/s

On applying the formula we get

\(K.E = \frac{1}{2}mv^2\)

\(K.E = \frac{1}{2}\times \frac{200}{1000} \times 20\times 20= 40J\)

Hence** option (4)** is correct.

__Additional Information__

**Velocity**: It is a**vector quantity**that is defined as the rate of change of its position with respect to time.

Velocity = Displacement/Time

**Vector Quantity**: Those quantities which require both**magnitudes**, as well as**direction**, are known as a vector quantity.

**Example of Vector quantity** - Displacement, Velocity, Work, Force etc..