Question

A bus decreases its speed from 80 km/h to 60km/h in 5s. Find the retardation

Answer 1

u=200/9 m/s  v=150/9 m/s  t=5s         a=v-u /t    = -10/9 m/s2

Answer 2

Friend, here's your answer

Retardation Is nothing but the stopping acceleration.
Retardation=Acceleration=change in velocity/time
a=(v-u)/t
=(60-80)/5
= -20/5= -4m/s^2 or just 4m/s^2
(negative denotes the stopping acceleration)

hope it helps:)

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