help with acceleration

For constant acceleration problems use one or more of the following equations, as appropriate:

v = u + at

v² = u² + 2as 

s = ut + (1/2)at²

where u = initial velocity, v = final velocity, a = acceleration, t = time taken, s = distance travelled.

First one:  v_f = v_o + at        (velocity final = velocity original + accel * t)        v_f =6.6 m/s      v_o = 0  

     then use   x_f = x₀  + v * t         x_f  = final position   x_o = original position (0)

Second one : x_{f =} x₀ + v_ot + 1/2 at^2    to find a

    then  use  v_f = v_o  + a t   to find  v_f