WAEC - Physics (1990 - No. 7)
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)
66 kg
55 kg
44 kg
22 kg
11 kg
ব্যাখ্যা
Reading = mg + ma = m(g + a) = 55(10 + 2)
= 660N = 66kg
= 660N = 66kg