Question

A moving body has KE equal to 10J.what is work done ti stop it?

Answer 1

Work done = change in kinetic energy
So, 10j required to stop it

Answer 2

Concept:

Change in kinetic energy can be defined as the work done by the particle.

Given:

The Kinetic Energy of the given body is equal to 10 J.

Find:

The work is done to stop the moving body.

Solution:

At the final state, the body is stopped, i.e, the velocity of the body becomes zero.

So, kinetic energy at the final state, KE = (1/2) mv²

KE = (1/2)m(0)² = 0 J

Change in kinetic energy = Final - initial = 0 - 10 J = -10 J

As the change in the kinetic energy is the work done,

So, work done is -10 J.

Hence, the work done to stop the moving body having the kinetic energy of 10 J is -10 J.

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