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: ->->->->->->->->->->->-> (start in the next line):
The balls average velocity would be 2.5 cm/sec
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Because I just took the final velocity and divided it by the initial velocity to get what I thought would be the average velocity without an equation to do so.
Does it make sense for the average velocity to be less than the initial or the final velocity?
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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: ->->->->->->->->->->->-> (start in the next line):
The ball would have traveled 30 cm during that time.
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• At what average rate did its velocity change with respect to clock time during this interval?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
The average rate = change in A/change in B
average rate = change in velocity/ change in clock time
(10cm/sec – 4 cm/sec)/(3 sec – 0 sec) = 2 cm/sec
The average rate that its velocity changed with respect to clock time was 2 cm/sec
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20 minutes
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Solution
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