21. Help please

Based on data from a research group, a model for the total stopping distance of a movmg car in terms '6 of its speed is s=1.4v + 0.074v2. where SIS measured in end v in mph. The linear term 15w models the distance the car travels during the time the driver perceives a need to stop until the bra es ' are applled. and the quadratic term 0.074\\i2 models the additional braking distance once they are ds applied. Find 3\" at v = 50 and v =70 mph, and interpret the meaning of the derivative. v E} ds = : v Atv 50mph, dv D d s 7777' W l} r l Atv=70 mph, Ehe V Interpret the derivative Choose the correct answer below Q A. The derivative represents the deceleration of the car after the driver applies the brakes. x; B. The derivative represents the additional number of feet needed to stop a car for a 1 mph Increase in the speed. . The derivative represents the total time needed for the car to completely stop. - . The derivative represents the distance traveled by the car in feet for a velocrty in mph