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course phy 121

The problem:A ball is moving at 10 cm/s when clock time is 4 seconds, and at 40 cm/s when clock time is 9 seconds.

• Sketch a v vs. t graph and represent these two events by the points (4 sec, 10 cm/s) and (9 s, 40 cm/s).

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• Sketch a straight line segment between these points.

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• What are the rise, run and slope of this segment?

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The rise of is 30, the run is 5 and the slope is 6.

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• What is the area of the graph beneath this segment?

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10cm/s + 40cm/s = 50cm/s / 2 = 25cm/s

25cm/s * 5s = 125cm

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