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
The correct answer is: D
Explanation
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
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