Question

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

Answer 1

V=60

U=80

t= 5s

a=v-u/t

60-80/5

a= -4

Answer 2

u=80km/h

=80*1000/3600

=800/36m/s

v=60km/h

=60*1000/3600

=600/36m/s

a=v-u/t

=600/36-800/36/5

=-200/36*5

=-10/9

=-1.11m/s^2