Question

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joule, the angle which the force makes with the direction of motion of the body is

• A. 0°
• B. 30°
• C. 60°
• D. 90°

Answer 1

The correct option is C

60°

$W=Fscos\theta$
$\Rightarrow cos\theta =\frac{W}{Fs}=\frac{25}{50}=\frac{1}{2}$
$\Rightarrow \theta =co{s}^{-1}\left(\frac{1}{2}\right)$
$\Rightarrow \theta ={60}^{\circ }$