A man weighing 160 lb stands on the floor of an elevator. What force will be exerted on floor if it (i) descends with a uniform acceleration of 1 ft/sec 2 (pi) ascends with a uniform acceleration of 1 ft/sec 2

(a) When elevator descends weight will be 155.026 lb

(b) When elevator ascends weight will be 164.954 lb    

Explanation:

It is given weight of man on the floor of elevator F = 160 lb

Acceleration due to gravity

At the floor of elevator weight is equal to

So

m =

(ii) When the elevator descends with uniform acceleration

Weight will be equal to  

(ii) When elevator is moving upward

Weight is equal to

the part of the wave he is travelling on is the crest