3. A motorist driving on a straight and level road approaches an intersection. He sees a stop sign and applies his brakes. His car slows down in a way that his velocity, in meters per second, after t seconds is v(t) - 80-1013 . [1] a) Determine the initial velocity of the car. [2] b) How long does it take the car to stop? [1] c) Determine the acceleration function of the car. [2] e) Calculate the average acceleration of the car while braking