Question

A train changes its speed from 36 km /hr to 72km/hr in 9 seconds. Find the average acceleration

Answer 1

Initial velocity, u = 36 kmph = 10 m/s
Final velocity, v = 72 kmph = 20 m/s
Time, t = 9 s 
Acceleration, a = (v-u)/t = 10/9 m/$s^{2}$