A girl whose mass is 55kg stands on a spring - weighing machine inside a...

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 2ms1. What will be the reading on the machine? (Take g = ms^-2)

A. 66 kg
B. 55 kg
C. 44 kg
D. 22 kg
E. 11 kg

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Correct Answer: Option A

Explanation

Reading = mg + ma = m(g + a) = 55(10 + 2)
= 660N = 66kg

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A girl whose mass is 55kg stands on a spring - weighing machine inside a...

Correct Answer: Option A

Explanation

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