How Do You Solve for Time and Final Velocity in Physics Equations?

[kraaaaamos]

[URGENT] Velocity and Acceleration - - PLEASE HELP : (

Homework Statement

 = delta

6. (a) The velocity equation for an object moving with constant acceleration a is given
as vf = vi + a t . Solve this equation for the time interval  t.
(b) The position equation for an object moving with constant acceleration is given as
x = vit + ½ a(t)2 . Substituting the  t obtained from (a) into this equation, solve for (vf)2 .

Homework Equations

N/A

The Attempt at a Solution

for a) i rearranged the equation to t = (Vf-Vi) / a
b) I substituted (a) into (b)

x = Vi [ (Vf-Vi)/a ] + 1/2 a [ (Vf-Vi)/a ]^2

am i doing it right?
how do i simplify that to solve for (Vf)^2

 

[learningphysics]

Yeah, you're doing it right... multiply everything out... try to simplify.