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A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the

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A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g=9.8m/s^2)

(a) 400J

(b) 1960J

(c) 250J

(d) 2514J
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Correct option is (b) 1960J

For explanation: F = 20kg wt = 20×9.8N

s = 20m

θ = 60°

W = Fscosθ = 20×9.8×20×cos⁡60°

W = 1960J.
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