Question

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

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

Answer 1

The correct option is C ${60}^0$

According to the question,

we know that $W=F.S$

$W=F.S\cos \theta$

$25-5\times 10\cos \theta$

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

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

$\theta ={60}^{\circ }$