MCQ practice · SSC Physics Board questions · Chapter 4: Work, Power and Energy
How much work is done in taking the object from A to B?
Think it through first, then pick an option.
- a 1960 J
- b 3920 J
- c 5880 J
- d 9800 J
Answer and explanation
Correct answer: b 3920 J
B is 40 m above A. The work of lifting equals the gain in potential energy: W = mgh = 10 × 9.8 × 40 = 3920 J.
Why the other options are wrong
- a 1960 J: This is not the answer: 1960 J = 10 × 9.8 × 20, the work for 20 m. A to B is 40 m, so 10 × 9.8 × 40 = 3920 J.
- c 5880 J: This is not the answer: 5880 J = 10 × 9.8 × 60, and 60 m is the distance from B to C. A to B is 40 m, so 3920 J.
- d 9800 J: This is not the answer: 9800 J = 10 × 9.8 × 100 is the work for the whole way A to C. Up to B is 40 m, so 3920 J.
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