The weight of man in a lift moving with same acceleration upwards… - Vidyadip

MCQ

The weight of man in a lift moving with same acceleration upwards is $608\,N$ , while the weight of the same man in the life moving down wards with the same acceleration is $368\,N$ . His normal weight is ............ $N$

A
$480$
✓
$488$
C
$588$
D
$240$

✓

Answer

Correct option: B.

$488$

b
When the life accelerates at a upwards

$m(g+a)=608$ $...(1)$

when the lift accelerates at a downwards

$m(g-a)=368$ $...(2)$

eq. $(1)+$ eq. $( 2)$

$\Rightarrow 2 \mathrm{mg}=608+368$

$\Rightarrow \mathrm{mg}=\frac{976}{2}=488 \mathrm{N}$

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