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  4. A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 ms-2 What would be the reading on the scale? (g = 10 ms-2)

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Q. A man weighs $80\, kg$. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5 \,ms^{-2}$ What would be the reading on the scale? ($g = 10\, ms^{-2})$

BHUBHU 2007Laws of Motion

Solution:

When the lift is accelerating upwards with acceleration $a$, then reading on the scale
$R=m(g+a)=80(10+5) N =1200\, N$.