Question

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 ${60}^o$ to the ground, the work done by him is

• A. 1960 J
• B. 196 J
• C. 1.96 J
• D. 196 kJ

Answer 1

The correct option is A 1960 J

$F=20kg-wt=20\times 9.8N$
$\theta ={60}^o$ and $s=20m$
Work done = Fs cos $\theta$
$=20\times 9.8\times 20\times cos{60}^o$
$=1960J$