A girl whose mass is 55kg stands on a spring - weighing machine inside a...
PHYSICS
WAEC 1990
A girl whose mass is 55kg stands on a spring - weighing machine inside a lift. When the lift starts to ascend, its acceleration is 2m/s. What will be the reading on the machine? (Take g = ms-2)
- A. 66 kg
- B. 55 kg
- C. 44 kg
- D. 22 kg
Correct Answer: A. 66 kg
Explanation
Reading = mg + ma = m(g + a) = 55(10 + 2) = 660N = 66kg
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