In the 74s after lift-off, the shuttle Challenger travels 36km. Assuming constant acceleration, calculate the acceleration of the shuttle in m/s^2.

G:

t = 74s

d = 36km

Which equation would I use to solve this? None of the equations I have will work, and I'm not sure which kind of velocity to calculate (instantaneous, average, initial, final). Everything I tried so far failed. The correct answer (according to my sheet) is 13m/s^2.