A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 $m s^{- 1}$ . The amount of work done is_ and _.

-1 KJ

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1 KJ

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-2 KJ

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None of these

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Solution

The correct options are
A
-1 KJ

C
-2 KJ

The work done to stop the block would be negative as the force applied would be opposite to the direction of motion. Since the body possesses only kinetic energy and no potential energy (as its position is not mentioned, so we assume it doesn't possess potential energy). From work energy theorem the work required to stop the block will be equal to its kinetic energy.

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