A city planer is working on the redesign of a hilly portion of a city. An important consideration is how sleep the roads can be so that even low-powered cars can get up the hills without slowing down. A particular small car, with a mass of 1100kg, can accelerate on a level road from rest to 21m/s (75km/h) in 14.0s. Using these data, calculate the maximum steepness of a hill.