Q. A body of mass $5\ kg$ is placed at the origin, and can move only on the x-axis. A force of $10\ N$ is acting on it in a direction making an angle of $60{^\circ}$ with the x-axis and displaces it along the x-axis by $4\ metres$. The work done by the force is
A) $2.5\ J$
B) $7.25\ J$
C) $40\ J$
D) $20\ J$
Explanation
(d) $W = FS\cos\theta = 10 \times 4 \times \cos{60{^\circ}} = 20\ Joule$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.