Phy 121
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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):
I would guess that the ball was traveling at a rate of 1cm/sec.
It never goes less that 4 cm/s or more than 10 cm/s, so its average velocity wouldn't be 1 cm/s.
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
This is only a guess as we are not provided with the actual change in distance. We are only provided with the change in time.
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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):
Based on the given information, I would guess that the item traveled 3 cm.
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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):
As the information is not specific, we can only make a guess as to what the average rate is. If the object changes 3 cm (guess) in distance and it takes it 3 seconds to travel, then we divide the change in a / change in b. This would give us 1 cm/ sec. However, this answer cannot be taken as accurate as it is a guess.
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15 minutes
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&#Please compare your solutions with the expanded discussion at the link
Solution
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