Emily cycles for 2 minutes. She starts from rest and accelerates uniformly to 5 m/s in 40 seconds. She continues at 5 m/s for 60 seconds, then decelerates uniformly to rest in 20 seconds.

(a) Draw the speed-time graph. [2]

(b) Find her acceleration. [1]

(c) Find her average speed for the journey. [4]