Essay
The graph in the figure shows the net force acting on a 3.0-kg object as a function of time. 
(a) What is the acceleration of this object at time t = 2.0 s?
(b) Draw, to scale, a graph of the acceleration of this object as a function of time over the range t = 0.00 s to t = 7.0 s.
Definitions:
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