Braking distance. The data in the table shows the braking distance of Cheryl's car travelling at different speeds just before the brakes are applied. Speed 12. 5 15 16. 7 20 26. 7 29. 2 33. 3 (m/s) Braking distance 7. 80 11. 3 13. 9 20. 0 35. 6 42. 5 55. 6 (m) 12 (i) The data can be modelled by d = v²/k +c , where d represents the braking distance in metres, v represents the speed in m/s and k is a non-zero constant. State the value of c and give a reason for your answer. ​