Question

a bus decreases its speed from 80 kilometre to 60 kilometre in 5 sec find acceleration of the bus (convert km/h to m/s )​

Answer 1

Answer:

-800m/s

Explanation:

As the bus decreases its speed, there will be retardation.

Initially: distance= 80km = 80*1000m = 80,000m

             time = 5sec

Therefore, initial velocity, u = 80,000/5 = 16000m/s

Finally, distance = 60km = 60*1000m = 60,000m

           time = 5sec

Therefore, final velocity, v= 60,000/5 = 12000m/s

acceleration =  (v-u)/t

                    =(12,0000-16,000)/5

                    = -4000/5

                      = -800m/s

Therefore, retardation = 800m/s or acceleration = -800m/s