3 (a) A car starts from rest and accelerates uniformly reaching a velocity of 25 m/s after travelling 100m. It travels at this velocity for 750 m. Then it decelerates uniformly and comes to rest in 5 s. Use the method of velocity- time graph to: i) iii) Find its displacement in the first 20 s, Find its total displacement, and the total time taken. [11]​