Question

a bus is decreases its speed from 72km/h to 54km/h in 5 sec. find the acceleration

Answer 1

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Answer 2

initial velocity(u) = 72km/h = 72*5/18 = 20m/s.

final velocity(v) = 54km/h = 54*5/18 = 15m/s.

time = 5 sec.

acceleration = v-u/t

                     = 15-20/5

                     =  -5/5 m/s

                      =  -1 m/s .