6. The Highway Code says that at 20 m/s, the
reacting (thinking) distance of a driver is 14 m,
and the brakes take 3 seconds to halt the car.
a) What is the reaction time in this case?
b) Plot a velocity-time graph for these data
(assume the brakes are on steadily for 3 s).
c) Use the graph to estimate the speed at
which the driver would hit a wall 3
seconds after first noticing it.