Phy 201
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The problem:
A ball starts with velocity 4 cm/sec and ends with a velocity of 10 cm/sec.
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What is your best guess about the ball's average velocity?
answer/question/discussion: 1 cm/sec
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Without further information, why is this just a guess?
answer/question/discussion: we don't know the time it takes the ball to go from 4 to 10 cm/sec
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If it takes 3 seconds to get from the first velocity to the second, then what is your best guess about how far it traveled during that time?
answer/question/discussion: 2 cm/sec
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At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: 2 cm for every 1 second of clock time
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3 minutes
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