Question

a driver applies the brakes and it slows down the velocity of the bus from 80 kilometre per hour to 60 km per hour in 5 second calculate the acceleration

Answer 1

initial velocity (u)=80kmph=400/18m/s
final velocity (v)=60kmph=300/18m/s
time period=5seconds
a=v-u/t
a=300-400/90
a=-100/90
a=-1.1 m/s^2

Answer 2

U=80km/h=80×5/18=200/9
V=60km/h=60×5/18=50/3
t=5s
V=u+at
50/3=200/9+5a
-50/9=5a
a=-10/9m/s^2