A man standing on a lift that is descending does not feel any weight because
- the inside of the lift is air tight
- the lift is in vacuum
-
the lift's acceleration is same as acceleration due to gravity
- there is no gravitational pull on the man in the lift
The correct answer is: C
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
There is an explanation video available .