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phy 201
Your 'cq_1_03.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** CQ_1_03.1_labelMessages.txt **
The problem:
A ball starts with velocity 0 and accelerates uniformly down a ramp of length 30 cm, covering the distance in 5 seconds.
• What is its average velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
30cm/5sec=6cm/sec
average= 3cm/sec
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• If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
You know its average velocity, and you know the initial velocity is zero.
What therefore must be the final velocity?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
6cm/sec
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• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
6cm/sec
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• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
3cm/sec
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Your answers to the preceding two questions were correct. Your answer on this question doesn't have the right units, nor does it follow from the definition of average rate.
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• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> (start in the next line):
Positive straight line
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Would the slope be positive, negative or zero?
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*#&!*#&!
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You have a one error in reasoning, related to errors on the preceding 'seed' question. If you have resolved the questions on that document, you should be able to easily correct this one. Address that document first. Once we have it straight, you'll find this one easy to correct.
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