Question

a bus decreases its speed from 80 km h to 60 km h in 5 sec find the acceleration of the bus

Answer 1

Answer: -1.11 m sec^-2

v = u+at

v= 60 kmph

u=80 kmph

t= 5 sec

a= (v-u)/t

v-u or Detla V ie a decrease of 20 KMpH in 5 sec the sign is negative . = -5.55 m/sec

plugging this in formula if a:

a=-5.55 / 5

= 1.11 m per sec^2

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note 20 km = 20000 meters

note 1 hour = 3600 seconds