passwella.
Menu

JAMB Physics 2007 Question 41

Question 41

Work, Energy and Power

A boy drags a bag of rice along a smooth horizontal floor with a force of 2 N applied at an angle of 60° to the floor. The work done after a distance of 3 m is

  1. A.6 J.
  2. B.5 J.
  3. C.4 J.
  4. D.3 J.
Show the answer and explanation

Answer: D (3 J.)

Explanation

Only the horizontal component of the force does work: W = F cos 60° × s = 2 × 0.5 × 3 = 3 J.