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52. (II) A sports car accelerates approximately as shown in the velocity-time graph of Fig. 2-43. (The short flat spots in the curve represent manual shifting of the gears.) Estimate the car's average acceleration in (a) second gear and (b) fourth gear. 50 5th gear 40 4th gear 3rd gear 30 v(m/s) 20 2nd gear as aRyOR 10 Ist gear misInuo 0 t ( s) wordhel mol 0 10 20 30 40 FIGURE 2-43 Problem 52. The velocity of a car as a function of time, starting from a dead stop. The flat spots in the curve represent gear shifts