Question

8. A bus was moving with a speed of 54 km/h. On applying brakes it stopped in 8 seconds. Calculate the acceleration​

Answer 1

Answer: acceleration is -15/8 m/s²

Explanation:

      Initial Speed  (u)= 54 km /hr = 54 *1000 m / 3600 s = 54*5/18 = 15 m/s

        ( 1km = 1000 m and 1hr = 60 mins = 60*60 seconds = 3600 seconds)

       Time = 8 seconds

      Final Velocity (V) = 0

we know that ,

        v = u + at

        0 = 15 + a*8

      0 = 15 + 8a

      a= -15/8 m/s²

  Therefore , acceleration is -15/8 m/s²