Find the work done by a force of $5 N$ in displacing a book through $20 c m$ along the direction of the force.

1 J

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3 J

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4 J

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5 J

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Solution

The correct option is A $1 J$
Given:
Force $F = 5 N$
Displacement $s = 20 c m = 0.2 m$
Work done = $F o r c e (F) \times d i s p l a c e m e n t (s)$
= $5 \times 0.2$
= $1 J$
The work done is positive as the book moves in the direction of the force.

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