A person pulls horizontally on a wagon. The wagon moves at an increasing speed along a smooth, frictionless horizontal ground. Then, at time t_s, the person abruptly stops pulling the wagon.

(a) Describe, in words, the motion of the wagon after the pulling stops.

(b) Using the axes below, sketch the velocity-time graph for the wagon. Include before and after the pulling stops and label on the graph time t_s.

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