You are driving the fathers new car and are approaching the intersection. At the same time, another car is approaching from right. You apply the brakes when you see stop sign. The distance from stop sign in metres, after time t, in seconds is s(t) = 430 - 72t + 3t2
a) how far from sign were you when you started to brake
b) Find velocity at time t
c) when did you stop
d) how far beyond sign did you go before stopping