How to find the average power of this problem?

Question

The electric motor of a model train accelerates the train from rest to 0.580 m/s in 20.0 s. The total mass of the train is 875 g. Find the average power delivered to the train during its acceleration.

i know you use average power=work over change in time, but how to find work?

Answer 1

Work = kinetic energy = mv^2/2. So Pave = (mv^2/2) / 20.