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9-113.

Sketch velocity and position graphs for the following scenario. Walk for 4 seconds, gradually increasing your speed. Stop for second. Walk slowly back towards start for seconds. Stop for seconds. Run towards the finish for seconds.

First quadrant piecewise, pieces as follows: from origin to (4, comma 4), from (4, comma 0) to (5, comma 0), from (10, comma 0) to (20, comma 0), from (20, comma 6) continuing to the right.

First quadrant continuous piecewise, pieces as follows: concave up curve from origin to (4, comma 4), horizontal to (5, comma 4), linear to (10, comma 2), horizontal to (20, comma 2), increasing to (25, comma 8).