foundations of physics

An object starts from rest at x=0 m at time t=0 s. Five seconds later the object is observed to be at x=40.0 m and to have velocity vx = m/s a) Was the object’s acceleration uniform or nonuniform? explain your reasoning. b) Sketch the velocity vs time graph implied by these data. Is the graph a straight line or curved, concave upward or downward?

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