JEE Main Physics question
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° with the x-axis and displaces it along the x-axis by 4 metres. The work done by the force is
Answer: (D)
Solution
W = F cosθ × d = 10 × cos60° × 4 = 10 × 0.5 × 4 = 20 J.