Maths mechanics - hmmm?

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cesc0836

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A man of mass 75kg travels upwards in a lift which is decelerating at 0.4ms^-2. Find the force exerted by the man on the floor of the lift?
 
The lift move up in deceleration so the "acceleration of the lift is downwards. Hence total downward accn is 9.84m/s^2
Hence the force exerted on the floor of the lift is 75(9.84)newtons.
 
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