Acceleration formula is Vf-Vi divided by time. Final velocity = 5, Initial Velocity = 3, and time is 8. So, do in a calculator (5-3) divided by 8. Or step by step: 5-3 = 2 2/8 = 0.25 And units for acceleration is m/s/s (m/s squared) so it is 0.25m/s^2 (squared)