The graph shows how the braking distance, d, of a car depends on the velocity, v, of the car when the brakes are first applied. An equation relating braking distance, d, to velocity, v, is d = v^2/ c. where C is a constant. Use the equation and data from the graph in Figure 1 to calculate a value for C. Give a unit for C – 8003.

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1. From the graph, I chose:
   v = 20 m/s and d = 31 m

   The equation is:
   C = v² ÷ d

   C = 20² ÷ 31 = 400 ÷ 31 = 12.9

   So the value of C = 13

   Unit: m/s²

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