Question on: JAMB Physics - 2024
What will be the weight of a man of mass 60 kg standing in a lift if the lift is descending vertically at 3 m/s2?
A
780 N
B
546 N
C
660 N
D
420 N
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Correct Option: D
Here's how to solve the problem:
- Identify the forces: Weight W = mg, where m = 60 kg and g ≈ 10 m/s².
- Determine net acceleration: Lift descends at 3 m/s², so apparent acceleration = g - a = 10 - 3 = 7 m/s².
- Calculate apparent weight: W' = m x (g - a) = 60 x 7 = 420 N.
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