A miniature train runs on a track, which has a straight horizontal section AB. The power of the train's engine t seconds after passing the point A is given by (3 + 8t - 3/5t²)kW. The time taken to travel from A to B is 5s.
a) show work done by the engine between A and B is 90 000J.
b) The total mass of the train and its load is 1000kg, and the speed of the train at A is 4 m/s. Given that the work done against resistances between A and B is 13500J, calculate the speed of the train at the point B.
I really have no idea how to do this question