Answer:
upwards
downwards
Explanation:
Given:
weight of the person, ![w=688\ N](https://tex.z-dn.net/?f=w%3D688%5C%20N)
So, the mass of the person:
![m=\frac{w}{g}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7Bw%7D%7Bg%7D)
![m=\frac{688}{9.81}](https://tex.z-dn.net/?f=m%3D%5Cfrac%7B688%7D%7B9.81%7D)
![m=70.132\ kg](https://tex.z-dn.net/?f=m%3D70.132%5C%20kg)
- Now if the apparent weight in the elevator,
![w_a= 726\ N](https://tex.z-dn.net/?f=w_a%3D%20726%5C%20N)
<u>Then the difference between the two weights is :</u>
![\Delta w=w_a-w](https://tex.z-dn.net/?f=%5CDelta%20w%3Dw_a-w)
![\Delta w=726-688](https://tex.z-dn.net/?f=%5CDelta%20w%3D726-688)
is the force that acts on the body which generates the acceleration.
Now the corresponding acceleration:
![a=\frac{\Delta w}{m}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%5CDelta%20w%7D%7Bm%7D)
![a=\frac{38}{70.132}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B38%7D%7B70.132%7D)
upwards, because the normal reaction that due to the weight of the body is increased here.
- Now if the apparent weight in the elevator,
![w_a= 598\ N](https://tex.z-dn.net/?f=w_a%3D%20598%5C%20N)
<u>Then the difference between the two weights is :</u>
![\Delta w=w-w_a](https://tex.z-dn.net/?f=%5CDelta%20w%3Dw-w_a)
![\Delta w=688-598](https://tex.z-dn.net/?f=%5CDelta%20w%3D688-598)
is the force that acts on the body which generates the acceleration.
Now the corresponding acceleration:
![a=\frac{\Delta w}{m}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B%5CDelta%20w%7D%7Bm%7D)
![a=\frac{90}{70.132}](https://tex.z-dn.net/?f=a%3D%5Cfrac%7B90%7D%7B70.132%7D)
downwards, because the normal reaction that due to the weight of the body is decreased here.