If a fence were built across the fault in 2005 how far apart will the two sections of now broken fence be in 2030

The two sections will be 125cm apart in 2030.

Explanation:

The rate of movement in the San Andreas fault is said to be between 4 and 6 cm a year. I am going to use 5 cm a year.

The fence was built in 2005, so in 2005 the separation was of 0 cm.

2030 is 2030-2005 = 25 years from 2005, so the separation is of 25*5 = 125 cm.

The two sections will be 125cm apart in 2030.

a displacement distance is size of displ

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.