A. the inside of the lift is air tight
B. the lift is in vacuum
C. there is no reaction from the floor of the lift
D. there is no gravitational pull on the man in the lift
Correct Answer:
Option C – there is no reaction from the floor of the lift
Explanation
The resultant force acting on the man is given by w = mg – R
Mg – mg = 0
The man feels weightless because the reaction, R is equal to the weight mg
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