An Aerodynamic (friction-less) car takes about 270 Newtons of force to maintain a speed of 25m/s. How much horsepower is required from the engine to maintain that speed? How much horsepower is required for the same car to accelerate from 0-25m/s in 6 seconds? I thought it was a pretty easy problem then I realized I couldn't divide joules by any sort of time. Ek=(1/2)(1000kg)(25m/s)^2 which gets me 25,000J, but power is J/t and I only have J, I somehow need to figure out how much time it takes to maintain 25 m/s from a force of 270N or have time in somewhere and I tried saying 270N = 1000kg * 25m/s * (1/t), which gave me 270s when I solved for t. Is that a coincidence or is that some mathematical tautology that tells me nothing? It says 25m/s, can I just assume I divide by 1 second? Or what? How do I get a time from this to calculate power? Thanks.