Question

a bus decreases its speed from 144 km per hour to 54 kilometre per hour in 5 seconds find the acceleration of bus

Answer 1

u = 144km/h = 40m/s
v = 54km/h = 15m/s
t = 5s
a = (v-u)/t
a = (40-15)/5
a = 25/5
a = 5 m/s2

Answer 2

144×5/18=60m/s
54×5/18=15m/s
t=5s

a=v-u/t
a=(15-60)/5
a=(-45/5)
a=-9m/s square