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
The correct answer is: A
Explanation
Reading = mg + ma = m(g + a) = 55(10 + 2)= 660N = 66kg