Find the velocity vb for the case where the acceleration is 7.66 m/s2. anawer in units of m/s

Xi=0m
Xf= 105m 
a= 7.66m/s^2
Vi= 0m/s ( I am assuming that the initial velocity was zero. I hope the question said something like "started from rest" or something)
Vf= UNKNOWN

First, I would use this equation to find time:








Once you have found time, use this equation to find final velocity:





Does this help?