The position of a racing car, which starts from rest at t = 0 and moves in a straight line, is given as a function of time in the following Table. Estimate
(a) Its velocity and
(b) Its acceleration as a function of time. Display each in a Table and on a graph.

0.25 0.50 I (s) x (m) t (s) x (m) 20.36 28.31 37.65 48.37 60.30 73.26 87.16 1.50 1.00 4.62 1.94 2.00 8,55 2.50 0.75 0.46 1.06 13.79 0.11 3.50 4.00 4.50 5.00 5.50 6.00 3.00