A car moves along a straight horizontal road and starts off at a steady speed. The speed-time graph in Fig. 1.1 shows the car’s motion from time t = 0. Fig. 1.1 is a speed-time graph of speed (m/s) plotted against time (s). At time t = 5.7 s, the driver notices a road obstruction. A short time later the driver uses the brakes, and the car starts to slow down.
(a(i))[1]
Using Fig. 1.1, determine the car’s speed at time t = 0.
(a(ii))[2]
Using Fig. 1.1, determine the distance travelled by the car between the driver noticing the obstruction at t = 5.7 s and the car starting to slow down.
(a(iii))[3]
Using Fig. 1.1, determine the distance travelled by the car between t = 0 and t = 11.2 s.
(b)[3]
The car’s speed affects both the thinking distance and the braking distance. State one factor that affects only the braking distance of the car. Explain how a change in this factor increases the braking distance.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “29\text{ m s}^{-1}” …