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  4. A man, of mass 60 kg, is riding in a lift. The weight of the man, when the lift is accelerating upwards and downwards at 2 ms -2 are respectively (taking g=10 ms -2 )

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Q. A man, of mass $60\, kg$, is riding in a lift. The weight of the man, when the lift is accelerating upwards and downwards at $2\, ms ^{-2}$ are respectively (taking $g=10\, ms ^{-2}$ )

AMUAMU 2010

Solution:

When the lift is accelerating upwards with constant acceleration $a$,
then Weight $w=m(g+ a)$
$=60(10+2)=60 \times 12=720\, N$
When the lift is accelerating downwards at the rate of $a$,
then Weight $w=m(g-a)$
$=60(10-2)=60 \times 8=480\, N$