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
Correct Answer: Option A
Explanation
Reading = mg + ma = m(g + a) = 55(10 + 2)
= 660N = 66kg