Buses travel at 25 m/s then decelerate steadily. It comes to a complete stop in 40 second. What is its acceleration?

Given is the velocity of the bus at 25 meters per second. Then it decelerates steadily. It stops after 40 seconds. To calculate for the acceleration, use this formula:

a = (vf - vo) / t

vf = 0 m/s (complete stop)

vo = 25 m/s

t = 40 s

Therefore,

a = (0 - 25) m/s / 40 s

a = - 0.625 m/s^2