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):
7cm/s
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• Without further information, why is this just a guess?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Because we don’t’ know what the actual distance traveled was and how long it took, so all we can do is average the two velocities and guess at the average for the entire journey
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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):
32 cm. The velocity changed at 6 cm/second rate… for three seconds, meaning 6+12_18 = 32 cm.
6 cm/s is the change in velocity, and is not a rate
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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):
6cm/s
this is change in velocity, not rate of change of velocity
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________________________________________
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Your instructor is trying to gauge the typical time spent by students on these questions. Please answer the following question as accurately as you can, understanding that your answer will be used only for the stated purpose and has no bearing on your grades:
• Approximately how much time did you spend on this question
15 minutes
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20 min
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