Question

A bus decreases. Its speed from 80km^- 1 to 60kmh^-1 in 5s. Find the acceleration of the bus.

Answer 1

Given,

u = 80 km/h

v = 60 km/h

t = 5 s

Now,

     u = 80 km/h¹                                     v = 60 km/h¹

        =  80000 m / 3600 s                        =  60000 m / 3600 s

        =  200 / 9 m/s¹                                    =  100 / 6 m/s¹

  a = v-u/t

      =  (100/6 - 200/9) m/s¹  / 5 s

      =  (300-400 /18) m/s¹    / 5 s

      =  (-100 /18) m/s¹    / 5 s

      =  -1.1 m/s²