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.
• What is your best guess about the ball's average velocity?
answer/question/discussion: ->->->->->->->->->->->-> : To find average velocity you must use the formula:
average velocity = displacement / time elapsed
However we only know the amount of time elapsed so we cannot make a guess. We can fill in the formula up to this point:
Average velocity = displacement / (6 cm/sec)
• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> : It is just a guess because you do not have all the information to correctly answer the question.
• 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: ->->->->->->->->->->->-> : We do not know all the information needed but we could guess and say that it traveled 3 cm/sec
• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
to find average rate you need A with respect to b (change in A) / (change in B)
we do not know how far the object traveled so we cannot solve for average rate. We can say that the change in clock time is 3 seconds.
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10 minutes
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Solution
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