Phy 121
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.
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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: ->->->->->->->->->->->-> : vAve = 30 cm / 5 s = 6 cm/s
• 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: ->->->->->->->->->->->-> : vAve = (initial + final)/2 so 6 cm / s = (0 cm / s + x) / 2 so 12 cm / s = 0 cm / s + x so 12 cm / s = final velocity
• By how much did its velocity therefore change?
answer/question/discussion: ->->->->->->->->->->->-> : Change in velocity = 12 cm / s
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion: ->->->->->->->->->->->-> : Average rate of velocity change = 12 cm/s / 5 s = 2.4 cm/s
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion: ->->->->->->->->->->->-> : A graph of velocity vs. clock time would be increasing at an increasing rate
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10 minutes
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&#Very good responses. Let me know if you have questions. &#