A car is travelling at 25.0 m/s. Its brakes can slow it down at a rate of - 3.75 m/s2. If
the driver sees a rhino 95 m away, what maximum time can he afford to wait before he
puts his foot on the brake so to avoid hitting the rhino?
v^2 = 2as
625/7.5 = 83.3
so he can afford to go 95-83.3 = 11.7 m before braking
11.7/25 = 0.46 seconds