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+2 votes
390k views
in Laws of Motion and Friction by (24.0k points)
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A boy stands on a weighing machine inside a lift. When the lift is going down with acceleration g/4, the machine shows a reading 30 kgf. When the lift goes upwards with acceleration g/4, the reading would be

(a) 18 kgf

(b) 37.5 kgf

(c) 50 kgf

(d) 67.5 kgf

1 Answer

+2 votes
by (34.3k points)
selected by
 
Best answer

Correct option (c) 50 kgf

Explanation :

While going down, machine reading is 30 kgf.

While going up. the reaction would be

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