A person of mass 60 kg is in a lift. The change in the apparent weight of the person, when the lift moves up with an acceleration of 2and then down with an acceleration of, is

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Solution

$W h e n t h e l i f t m o v e s u p w i t h a n a c c e l e r a t i o n o f 2 m s^{- 2}, t h e a p p a r e n t w e i g h t o f t h e p e r s o n i s, F^{'} = m [g + a] o r F' = 60 [9.8 + 2] o r F' = 60 \times 11.8 o r F' = 708 N . w h e r e m = 60 k g, g = 9.8 m s^{- 2}, a = 2 m s^{- 2} W h e n t h e l i f t m o v e s d o w n, t h e a p p a r e n t w e i g h t o f t h e p e r s o n i s g i v e n b y, F' = m [g - a] o r F' = 60 [9.8 - 2] o r F' = 60 \times 7.8 o r F' = 468 N .$

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