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A gardener pushes a lawn roller through ...

A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20 kg wt in a direction inclined at `60^(@)` to the grounds, find the work done by him. Take `g=9.8ms^(-2)`.

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`F=20kgwt=20xx9.8N`
`s=20m,theta=60^(@)`
Formula: `W=Fscostheta`
`=20xx9.8xx20xxcos60^(@)`
`=20xx9.8xx20xx0.5`
Work done `W=1960J`
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