A velocity–time graph for an object moving along the x axis

A velocity–time graph for an object moving along the x axis is shown in Figure P2.14. ]
(a) Plot a graph of the acceleration versus time.
(b) Determine the average acceleration of the object in the time intervals t = 5.00 s to t = 15.0 s and t = 0 to t = 20.0 s
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