The poition function (t)=t2−3t−4 repreent the poition of the back of a car backing out of a driveway and then driving in a traight line, where i in feet and t i in econd. In thi cae, (t)=0 repreent the time at which the back of the car i at the garage door, o (0)=−4

i the tarting poition of the car, 4 feet inide the garage. Determine the velocity of the car when (t)=0. Determine the velocity of the car when (t)=14