Below is the sketch of a speed-time graph for a car moving on a straight road for 12 seconds. The car starts at a speed of 4 ms-1 and increases its speed linearly to 14 ms-1 over the first 5 seconds, before maintained this speed for the remainder of the journey.
a.[2]
Work out the acceleration for the first 5 seconds.
b.[2]
Calculate the total distance covered by the car.