A body of 2 kg is suspended from the ceiling of an elevator moving up with an acceleration g. Its apparent weight in the elevator will be______________?
Correct answer: D. 39.2 N
- A. 9.8 N
- B. 19.6 N
- C. 129.4 N
- D. 39.2 N
Explanation
For an elevator accelerating upward, the apparent weight is the normal reaction N = m(g + a). With m = 2 kg and a = g = 9.8 m s^-2, N = 2 kg × (9.8 + 9.8) m s^-2 = 39.2 N. Students may choose 19.6 N by using only mg and ignoring the elevator’s upward acceleration.
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