Question

A rigid body moves a distance of 10m along a straight line under the action of a force of 5 N. lf the work done by this force on the body is 25 joules, the angle which the force makes with the direction of motion of the body is

• A. $0^{\circ }$
• B. ${30}^{\circ }$
• C. ${60}^{\circ }$
• D. ${90}^{\circ }$

Answer 1

Answer: (C)

we know,
$W=FScos\theta$
$cos\theta =\frac{W}{FS}$

$cos\theta =\frac{25}{50}$

$cos\theta =\frac{1}{2}$

$\theta =co{s}^{-1}0.5$
$\theta ={60}^0$