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/s2)
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Answer:
F=20kg−wt=20×9.8N
θ=60
o
and s=20m
Work done = Fs cos θ
=20×9.8×20×cos60
o
=1960J
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