Question

a bus decrease its speed from 80km/h to 60km /h in 5s. Find the acceleration of the bus

Answer 1

a=(v-u) /t
a=(60-80)/5
a=-4km/s^2

Answer 2

Hey Friends,

Acceleration=final velocity -initial velocity
-----------------------------------------
Time

Here,

Final velocity (v) =60km/h = 16.6 m/s
Initial velocity (u) = 80km/h = 22.2m/s
Time = 5seconds
Acc. =16.6-22.2/5

Acc. = -1.12 m/s²

Acceleration will be -1.12m/s²