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 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

waec 1990 physics

The correct answer is A. 66 kg

Reading = mg + ma = m(g + a) = 55(10 + 2)

= 660N = 66kg

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