During 12 s an engine increases the speed of a 1.5×103-kg vehicle from 13 m/s to 27 m/s. Assuming no losses, what average power is the engine producing? P = W/t W=FΔx W=ΔKE ΔKE=mvf2-mfi2 I tried finding the change in kinetic energy to solve the problem, but it didn't work. I got 3.4E3 W. I'm really lost. I've never done a power problem given only velocity and mass.