A cart moves to the right of the origin at 3.6m/s for 8s. It stops abruptly and remains stationary for 4 seconds. The cart then moves back towards the origin at 1.8m/s. Choose motion to the right to be in the positive direction.
I really do not under stand what "Choose motion to the right to be in the positive direction" and would this graph start at (0s,0m)? Can some one please give me a sketch of how it would look like? Thank you!