cq_1_021

phy 121

Your 'cq_1_02.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

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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):

Best guess would be done by averaging the two velocities, 4 + 10 = 14, 14 / 2 = 7, so 7 cm/s.

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Without further information, why is this just a guess?

answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):

You would need to know more information to work the problem out, without the information it is impossible.

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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):

Given the avg. rate of 7cm/s over a 3 second interval, you would have 21 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):

Take the 10 cm/s minus the 4 cm/s to get a change of 6 cm/s, then divide by the 3 second time interval, you get 2 cm/s/s of change.

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20 minutes

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&#Very good responses. Let me know if you have questions. &#