A block of mass 5 kg is sliding on a smooth floor with a velocity of 20 m/s. The amount of work required to stop it is ___ .

-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 is negative as the force applied is opposite to the direction of motion.

Since the body possesses only kinetic energy (due to its motion) and no potential energy (as there is no mention of its position, so we assume it to be at ground level) the work required to stop the block is equal to its kinetic energy.

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