Question

Please solve this using matlab and type in the codes here

The following data was obtained when the stopping distance d of a car on a wet road was measured as a function of the speed v when the brakes were applied: v (mi/h) 12.5 25 37.5 50 62.5 75 d (ft) 20 59 118 197 299 420 Use polyfit function to determine the coefficients of a quadratic polynomial d = a_2 v^2 + a_1 v + a_0 that best fits the data. Make a plot to show the data points (asterisk marker) and polynomial (solid line)

Answer 1

v = [12.5 25 37.5 50 62.5 75]
d = [20 59 118 197 299 420]
coeff = polyfit(v,d,2)
plot(v,d,'-x');

Output

coeff 0.066514 0.577714 2.600000

500 400 300 200 F 100 40 50 60 70 80 10 20 30