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Instantaneous velocity and instantaneous speed from graphs

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A monkey climbs vertically on a vine. Its motion is shown on the following graph of vertical position y vs. time t.
Graph of y (in meters) vs. t (in seconds) that starts at 6 m at 0sec, decreases linearly to 2m at 4 sec, stays constant at 2m from 4 sec to 7 sec, increases linearly to 5 m from 7 sec to 9 sec, then stays constant until 10 sec.
What is the instantaneous speed of the monkey at time t=5 s?
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