JAMB - Physics (2024 - No. 66)
What will be the weight of a man of mass 60kg standing in a lift if the lift is descending vertically at 3ms\(^2\)?
780N
546N
660N
420N
คำอธิบาย
The man's weight = T - ma
mass = 60kg, a = 3ms\(^2\)
The man's weight = m(g - a) = 60(10 - 3) = 60 x 7 = 420N