A train travelling along a straight track starts from rest at point A and accelerates uniformly to 20m/s in 20 s It travels at this speed for 60 s, then slows down unformly to rest in 40 s at point C . It stays at rest at C for 30 s ,then reverse direction , accelerating uniformly to 10m/s in 10 s , it travel at thos speed for 30 s ,then slows down uniformly to rest in 10 s when it reaches point B.
a , plot a graph of the motion of the train
b , use your graph to calculate
1, the train's displacement from point A when it reaches point C
2 , the train's displacement from point A when it reaches point B
3 , the train accelerate each time its speed change .​