A gardener pushes a lawn roller through a distance 20 m. If he applies a force of 20 kg-wt in a direction inclined at 60^@ to the ground, the work done by him is

A gardener pushes a lawn roller through a distance 20 m. If he applies

1.	A gardener pushes a lawn roller through a distance 20 m. If he applies a force of 20 kg-wt in a direction inclined at 60^@ to the ground, the work done by him is
Answer» 1960 J 196J 1.96J 196 kJ Solution :The work done by gardener is `W = F s cos theta` Here, `F = 20 kg wt = 20 xx 9.8 N = 196 N , s = 20 m , theta = 60^@` `:. W = 196 xx 20 xx cos 60^@ = 1960 J`