PLEASE HELP WILL MARK BRAINLIEST IF YOU EXPLAIN HOW YOU GOT THE ANSWER!!!

The answer for the questions are
a. 57N
b. 0 m/s^2
I just need to know how to solve it

PLEASE HELP WILL MARK BRAINLIEST IF YOU EXPLAIN HOW YOU GOT THE ANSWER The answer for the questions are a 57N b 0 ms2 I just need to know how to solve it class=