Question

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

Answer 1

intial speed = u = 54km/hr = 54000/3600 m/s = 15 m/s

final speed = v = 0 km/hr = 0 m/s

time = t = 8s

acceleration = a = ?
___________________

a = v-u/t

a = 0-15/8

a = -15/8

a = -1.875 m/s²
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acceleration is -1.875 m/s²