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course phy 121

2/7 10

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:

8 cm/s *3seconds= 24 cm/s

24 cm/s +12 cm/s= 36 cm/s

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

answer/question/discussion:

The average velocity involves the initial and final velocities:

12 cm/s + 36 cm/s /2= 24 cm/s

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How far will it travel during this interval?

answer/question/discussion:

24 cm/s * 3 seconds= 72 cm

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