Question

A child pulls a toy bus through distance of 8 m on a smooth horizontal floor. The string held in the child is hand makes an angle of ${60}^o$ with horizontal surface. If the force applied by child is 3 N. Calculate the work done by the child in pulling the toy car.

• A. 200
• B. 120
• C. 12
• D. 8

Answer 1

The correct option is C 12

$W=\overrightarrow{F}.\overrightarrow{s}$

$=Fscos\theta$

$=3\times 8\times cos\left({60}^o\right)$

$=24\times \frac{1}{2}J$

$=12J$