At the start of a Formula 1 race Lewis Hamilton, starting from pole position, accelerates uniformly until he reaches the first corner. His speed at the corner is 20 ms-1 and it takes him 4 s to reach this point.

(a) ​Calculate the acceleration of the formula 1 car. ​​​​​ (3)

(b)​Sketch (with a ruler!) a speed - time graph for the motion of Lewis Hamilton’s race car from the start of the race until it reaches the first corner.

Numerical values must be added to both axis.​​​​