**Problem 4:** A man pulls a trolley through a distance of 50 m by applying a force of 100 N which makes an angle of 30^{0} with horizontal. Calculate the work done by the man.

**Solution**

Force applied on the trolley, F = 100 N, Distance covered, d = 50 m

Angle between force and distance, θ = 30^{0}

Work done, W = ?

Formula W = Fdcosθ

Put the values, W = 100 × 50 × 0.866 (cosθ = 0.866)

OR W = 4330 J

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