6) The stopping distance d of a car driven at velocity v by an unimpaired person on a paved road in good weather is given by the following table. The function d(v), measured in feet, is twice-differentiable with d' (v) > 0. v: velocity (mph) 20 30 40 50 60 70 80 d: stopping distance (feet) 39 75 118 172 230 305 395 a) Find the average rate of change of the stopping distance of the car between 20 and 30 mph. Specify units. b) Estimate d'(78). Be sure to specify units. c) Find h'(v) given that h(v) = e.d(v)

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