Question 22
Work, Energy and PowerA force varying linearly with the distance acts on a body as shown in Fig. 4. The work done on the body by the force during the first 10 metres of motion is
- A.100 J
- B.150 J
- C.200 J
- D.300 J
- E.600 J
Show the answer and explanation
Answer: B (150 J)
Explanation
Work = area under the force–distance graph. The force falls from 20 N at 0 m to 10 N at 10 m, so the area is ½ × (20 + 10) × 10 = 150 J.