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)`.

Explanation

Here, `F=20kg wt=20xx9.8N`,
`s=20m, theta=60^(@)`
`W=F_(s)costheta`
`=20xx9.8xx20xxcos60^(@)`
`=20xx9.8xx20xx0.5=1960J`