Person X and Y push the block, with 10 N and 20 N force respectively. If the block moves by 10 m to the left, J of work is done by them on the block.

100

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300

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400

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Solution

The correct option is A 100
We know that, the amount of work done = Force x Displacement.

With respect to person X, the block gets displaced in the opposite direction of the force applied by him.
Therefore the work done by person X = Force x Displacement
=10 x -10 = -100 J

Whereas, with respect to person Y, the block gets displaced in the direction of the force applied.

Therefore, the work done by person Y = Force x Displacement
= 20 x 10 = 200 J

Therefore the net wok done = 200 - 100 = 100 J

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