Question

A moving body of 30kg has 60joules of kinetic energy. Calculate the speed

Answer 1

Answer:

The speed of the moving body is 2 km/hr.

Explanation:

Given, Mass of the moving body = 30 kg

And, Kinetic Energy of the body = 60 joules

We know that,

Kinetic Energy = Mass × Speed

60 = 30 × Speed

=> Speed = 60/30 = 2 km/hr

Hence, the speed of the moving body is 2 km/hr.

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Answer 2

Answer: The speed of the moving body is 2 m/s

Explanation: Kinetic Energy is a form of energy which is directly proportional to the mass of body and the square of velocity of the body.

the velocity is same as speed when talking with reference to a particular direction.

Mass of the body is, m = 30 kg

let the velocity of the body be v m/s

Kinetic energy of the body is 60 J.

$KE = \frac{1}{2} m*v^{2}$

$60 = \frac{1}{2} 30 *v^{2}$

$4 = v^{2}$

So, v=2m/s