A person of mass 50 kg stands on a weighing scale on a lift. If the lift is descending with a downwards acceleration of 9 m/${{s}^{2}}$, what would be the reading of the weighing scale? (g = 10 m/${{s}^{2}}$)
Mass of the person, m = 50 kg
Descending acceleration, a = 9 m/${{s}^{2}}$
Acceleration due to gravity, g = 10 m/${{s}^{2}}$ Apparent weight of the person,
R = m(g-a) =50(10-9) = 50N
.’. Reading of the weighing scale =R/g =50/10 = 5 kg