Q. A body moves a distance of 5m along a straight line under the action of a force of 10 N. If the work done is 25 J, then the angel 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) $W = Fs\cos\theta$
or $\cos{\theta = \frac{W}{Fs} = \frac{25}{10 \times 5} = \frac{1}{2}}\ or\ \ \theta = 60{^\circ}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.