1.1. The graph shows the speed, v metres per second (m/s), of a car at time t seconds.

Find the speed of the car at t = 7.

.................................................... m/s

1.2. It is claimed that the car has accelerated from 0 to 60 miles per hour in the first 10 seconds.
Does the graph support this claim?
Show your reasoning. Use 1 mile = 1.6 kilometres.

1.3. Use the graph to estimate the acceleration at t = 7.

...................................................m/s²

1.4. Georgina says that the graph shows that the speed of the car will continue to increase after 10 seconds.

Make one comment to show that this statement is incorrect.