physic
posted by Musa .
An automobile is moving in an easterly direction at a velocity of 100km/hr. He sees an emergency vehicle and slows down to 60 km/hour. If it takes him 5.0 seconds to slow down, what is his acceleration?

100 km/h = 27.78 m/s
60 km/h = 16.67 m/s
(delta V) = V2  V1
= 16.6727.78 = 11.11 m/s
acceleration = (V2 V1)/t = 2.22 m/s^2