Determining Acceleration

C42711

A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s² Determine the time for the feather to fall to the surface of the moon.

So, I wrote my given:
d=1.4 m
a= 1.67 m/s²
both initial and final velocity= 0

I know I am looking for time, but I have no idea what equation to use. I tried:
v_f= v_i+at , but I didn't get the right answer. The answer should be 1.29 s.
Any help would be much appreciated, please and thank you!:)

rock.freak667

Well what equation involves d,a,t and u (initial velocity)?

C42711

This does: d=v_i+1/2*at²
but I didn't get the right answer with that either, I got .75:(

C42711

I got the right answer now.:)