1. The problem statement, all variables and given/known data The driver of a car traveling at 71 ft/sec suddenly applies the brakes. The position of the car is s = 71t - 20t2, t seconds after the driver applies the brakes. After how many seconds does the car come to a stop? Round your answer to the nearest tenth. 2. Relevant equations 3. The attempt at a solution s=71t-20t2 0=71t-20t2 0=71-20t t=71/20 t=3.55 = 3.6 However the correct answer is 1.8, which is half my answer, but I do not understand why you would divide by 2? Or where I went wrong?