Question

a body of mass 2kg is moving with speed of 20m/s find the kinetic energy

Answer 1

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ANSWER :

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The mass of the object, m = 2 kg

The speed of the object, v = 20 m/s

The Kinetic Energy, K.E = ?

We know that ,

$kinetic \: energy = \frac{1}{2} mv ^{2}$

From this ,,,

Kinetic Energy ,K.E = 1/2 × 2 × (20 )^2

K.E = 400 J

The Kinetic Energy is 400 J.

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Answer 2

The kinetic energy = 400 J

Given :

A body of mass 2 kg is moving with speed of 20 m/s

To find :

The kinetic energy

Formula :

For a body of mass m kg is moving with speed of v m/s the kinetic energy

$\displaystyle \sf = \frac{1}{2} m {v}^{2}$

Solution :

Step 1 of 2 :

Write down mass and speed of the body

Here it is given that the body of mass 2 kg is moving with speed of 20 m/s

Mass of the body = m = 2 kg

Speed of the body = v = 20 m/s

Step 2 of 2 :

Calculate kinetic energy

The kinetic energy

$\displaystyle \sf = \frac{1}{2} m {v}^{2}$

$\displaystyle \sf = \frac{1}{2} \times 2 \times {(20)}^{2} \: \: J$

$\displaystyle \sf = \frac{1}{2} \times 2 \times 400 \: \: J$

$\displaystyle \sf =400 \: J$

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