In a test the velocity of a body was measured over a period of time, yielding the results shown in the table below. Plot the corresponding graph and use it to determine the acceleration of the body at times t = 0, t = 5 s and t = 9 s. You may assume
that the graph consists of a series of straight lines.
v (m/s) 0.0 3.0 6.0 10.0 14.0 15.0 16.0
t (s) 0.0 1.5 3.0 4.5 6.0 8.0 10.0