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JAMB Physics 2005 Question 30

Question 30

Work, Energy and Power

In the figure above, the work done by the force of 100 N inclined at an angle of 60° to the object dragged horizontally to a distance of 8 m is [Neglect frictional effect]

Diagram for this question
  1. A.800 J.
  2. B.800 J.
  3. C.400 J.
  4. D.100 J.
Show the answer and explanation

Answer: C (400 J.)

Explanation

Only the horizontal part does work: W = F cos 60° × s = 100 × 0.5 × 8 = 400 J.