Answer 2_2_9

(a) Thinking distance = area of the rectangle = 0.5 s × 20 m/s = 10 m

(b) Braking distance = area of the triangle = 1/2 × 4 s × 20 m/s = 40 m

(c) Total distance = 10 m + 40 m = 50 m

(d) Acceleration = (0 m/s - 20 m/s) ÷ 4 s = -5 m/s²

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