I'm having trouble on finding how to solve this question that I received.
A 1500kg race car's engine can produce 150,000 Watts of power. Assuming the race car is able to convert 75% of the energy into kinetic energy, how fast could the car go in 8 seconds?
I understand that I have the mass, work (with efficiency), initial velocity, and time. I tried using the Energy formula (Ei +/- W = Ef). Using that I found the final velocity but how was I supposed to incorporate 8 seconds into it?