A man weighs himself inside a lift. He weighs 72kg-wt when the lift goes up with a constant acceleration ‘a’ , while he weighs 69kg-wt when the lift goes down with the same acceleration. The mass of the man is?
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Expert's answer
2013-01-21T07:39:28-0500
According to the second Newton's law, the force acting on a man when the lift goes up with a constant acceleration is
F1 = M·(g+a), (1)
where M is the mass of a man. From the other side, the force acting on a man when the lift goes down with the same acceleration is
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