Question 1203139: A man with a mass of 65 kg stands in an elevator. The elevator initially accelerates uniformly for 1.8s followed by a period of a constant velocity of 2.5ms^-1 and then a final uniform deceleration for 1.8s.
a)Calculate the magnitude of the reaction force on the man from the elevator floor during the time it takes the elevator to come to rest.
b) The man uses the elevator again to travel to a lower floor. The elevator descends at the same speed and comes to rest in the same time as in (a). Calculate the reaction force on the man from the elevator floor during the time it takes to come to rest on the floor below.
c) Suggest and explain during the deceleration period, which direction of elevator travel would make the man feel
(i) lighter
(ii)heavier
d) In a stroke of bad luck, the elevator cable snaps and it falls freely under gravity. During the fall, the man experiences a sense of weightlessness.
Explain, using appropriate laws of motion, why the man feels a sense of weightlessness in this situation.
Answer by ikleyn(52879)   (Show Source):
You can put this solution on YOUR website! .
D U P L I C A T E
I just answered these questions once, by referring to the source in the Internet,
from which you can learn the subject and then solve the problem on your own.
https://www.mathsdiy.com/wp-content/uploads/2019/03/Lifts-SOLUTIONS.pdf
5 minutes after my first response, you posted your problem again.
I read your message this way, that you do not want to learn the subject at all,
don't want to do anything and only want to get the ready printed answer.
If so, then I lose all my interest to your messages. I do not need such " pupils ".
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