Engineering dynamics | fundamental problem 12 - 1 | rc hibbeler 13 edition | 'THE ENGINEERING WORLD'

I am going to make a series of dynamics problems, from the book "engineering mechanics by rc hibbeler 13 edition". This is the first fundamental problem from the series.
This is the problem of constant values there is no variable value therefore we use the 1st equation of motion problem is very simple but here two main things first here (vf) is count as ONLY (v) and (Vi) count as (v knot) these are only two things to learn from this fundamental problem. Some important points about how to understand the problem statement are given below:
1) read the problem carefully and highlights all the necessary objects.
2) look on values units cause in rc hibbeler 13edition book problems is given into two system fps and mks.
Other tips are for varible problems and i'll tell you when we'll be proceed.