Question

a body of mass 20 kg is constant motion with a velocity of 5 metre per second calculate its kinetic energy




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Answer 1

Answer:-

Kinetic energy of the body is 250 J .

Explanation:-

We have :-

• Mass of the body = 20 kg

• Velocity of the body = 5 m/s

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We need to calculate the kinetic energy of the body.

K.E. = ½mv²

Where :-

• K.E. is the kinetic energy of the body.

• m is mass of the body.

• v is velocity of the body.

Substituting values, we get :-

⇒ K.E. = ½ × 20 × (5)²

⇒ K.E. = 10 × 25

⇒ K.E. = 250 J

Some Extra Information:-

• Kinetic energy is the energy possessed

by a body because of it's motion. It is a

scalar quantity.

• Kinetic energy of a body depends on

two factors :-

(a) Mass [K.E. ∝ m]

(b) Velocity [K.E. ∝ v²]

Answer 2

Given :-

Mass = 20 kg

Velocity = 5 m/s

To Find :-

kinetic energy

Solution :-

Here,

We have to find Kinetic energy. So, By using the formula

$\bf\red{K_{e} = \dfrac{1}2 \times m \times v^2}$

$\sf K_e = \dfrac{1}{2} \times 20 \times 5^2$

$\sf K_e = 10 \times 25$

$\sf K_e = 250 \; J$

Hence, The kinetic energy is 250 J.

Know More :-

Joule (J) is the SI unit of energy.

meter per second is the SI unit of velocity

kilogram is the SI unit of mass.