Q. 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 $25\ joules$, 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) $90{^\circ}$
Explanation
(c) $W = Fs\cos\theta \Rightarrow \cos\theta = \frac{W}{F_{s}} = \frac{25}{50} = \frac{1}{2} \Rightarrow \theta = 60{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.