First bit of question is [ setting the scene before the questions ]
A ball rolls over an obstacle which has been placed on a flat horizontal surface. The diagrams opposite show a velocity-time graph, a displacement-time graph and the axes for an acceleration-time graph for the horizontal motion of the ball. The time axes for the three graphs are identical,
i haven;t got a scanner, but the graphs are simplistic
velocity-time graph has constant velocity, after .5 secs deaccelerates, at 1 second constant velocity, 1.5 secs accelerates, 2 secsconstant velocity