course Phy 121

13/Jul/2010 21:56

The problem: A ball accelerates at 8 cm/s^2 for 3 seconds, starting with velocity 12 cm/s.

What will be its velocity after the 3 seconds has elapsed?

answer/question/discussion:

Final Velocity = 12 cm/s + (8 cm/sec^2 * 3 sec) = 36 cm/sec

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Assuming that acceleration is constant, what will be its average velocity during this interval?

answer/question/discussion:

Average Velocity = (12 cm/s + 36 cm/s) / 2 = 24 cm/s

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How far will it travel during this interval?

Displacement = 24 cm/s * 3 sec = 72 cm

answer/question/discussion:

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