[填空题]
A city planner is working on the redesign of a hilly portio b2r vl zpbor;n;w7u;0n of a cit 3us+iv9b (gozy. An important consideration is how steep 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 1100 kg , can accelerate on a level road from rest to g b3iz(sv +9uo21$ \mathrm{~m} / \mathrm{s}(75 \mathrm{~km} / \mathrm{h})$ in 14.0 s . Using these data, calculate the maximum steepness of a hill. $^{\circ}$
