Phy 231
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 down a ramp of length 30 cm, covering the distance in 5 seconds.
• What is its average velocity?
answer/question/discussion:
Answer: ave vel = 30cm/5sec = 6 cm/sec.
• If the acceleration of the ball is uniform then its average velocity is equal to the average of its initial and final velocities.
answer/question/discussion:
Answer: An example of this is if a ball is rolling down a hill at uniform acceleration, and initial vel is 0m/s and final vel is 20m/s, the average of these numbers is 10m/s and thus 10m/s is the average velocity.
• You know its average velocity, and you know the initial velocity is zero. What therefore must be the final velocity?
answer/question/discussion:
Answer: The final velocity is 6cm/sec * 2 = 12m/s.
• By how much did its velocity therefore change?
answer/question/discussion:
Answer: 12m/s – 0m/s = 12m/s.
• At what average rate did its velocity change with respect to clock time?
answer/question/discussion:
Answer: average rate that velocity changed over time: 12m/s / 5sec = 2.4 m/s/s.
• What would a graph of its velocity vs. clock time look like? Give the best description you can.
answer/question/discussion:
Answer: The graph would be a increasing and a straight line. For every second, the y axis (velocity axis) would increase by 2.4. Here are some points. (0, 0), (1, 2.4), (2, 4.8), (3, 7.2).
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15 minutes
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&#Very good work. Let me know if you have questions. &#