A bus decreases its speed from 80 kilometres per hour to 60 km per hour in 5 seconds. find the acceleration of the bus.

Given, 

initial speed of the bus (u) = 80km/h = 80 x 5/18

= 22.22 m/s

Final speed of the bus (v) = 60km/h = 60 x 5/18 

= 16.67m/s

Time taken to decrease the speed (t) = 5s

Acceleration of the bus (a) = v-u/t = 16.67-22.22/5 = -1.11 m/ second square.

Negative sign of the acceleration indicates that the velocity of the bus is decreasing.

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