A city planner is working on the redesign of a hilly part of a city. A significant consideration is how steep the roads can be so that even low-powered cars can get up the hills devoid of slowing down. A specific small car, having a mass of around 920, can accelerate on a level road from rest to 18 (65) in 13.3.
By using these data, determine the maximum steepness of a hill.