Question

A lift is moving up with an acceleration of 5 m/s², If
g=10 m/s², The weight of the man is
A.) increased by 50%
B.) increased by 40%
C.) decreased by 20%
D.) decreased by 40%​

Answer 1

Answer:

(A)

Explanation:

Reason:

1. The elevator was travelling with an accln of 5m/s^2 and the g was = 10ms^-2
2. Also,now since the frame is non inertial (i.e. the elevator is moving) we make it inertial by assuming it at rest.
3. The frame is now inertial and so the net accln acting on the man in downward drxn = 10+5= 15ms^-2
4. Now the man has a wt = m(10+5)=>15m
5. If the elevator was at rest then the wt of the man would have been 10m
6. Hence 15m - 10m = 5m increase in wt.
7. Hence 5m/10m ×100 => 50% increase in wt
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9. it just involves vectors and a bit of pseudo force concept