The velocity-time graph shows the journey of a train.
A tangent is drawn to the graph at 120 seconds.
a) Use the tangent to work out an estimate for the acceleration of the train at 120 seconds to 2 d.p.
Give suitable units with your answer.
b) Use your answer to part a) to work out whether the train is speeding up or slowing down at this point.
Velocity (m/s)
80-
70-
60
50-
40-
30-
20
10
0 20 40 60 80 100 120 140 160 180 200
Time (s)