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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• If the position of a ball rolling along a track changes from 10 cm to 20 cm while the clock time changes from 4 seconds to 9 seconds, what is the average rate of change of its position with respect to clock time during this interval?
answer/question/discussion:
average velocity = change in displacement/ change in time
= (20cm – 10 cm)/( 9 seconds – 4 seconds)
= 10 cm / 5 seconds
= 2 cm / sec
• If the velocity of a ball rolling along a track changes from 10 cm / second to 40 cm / second during an interval during which the clock time changes by 3 seconds, then what is the average rate of change of its velocity with respect to clock time during this interval?
answer/question/discussion:
(40 cm/sec – 10 cm/sec) / 3 seconds
= 30 cm/sec / 3 seconds
= 10cm / sec
(cm/s) / (s) = (cm/s) * (1/s) = cm/s^2, not cm/s.
• If the average rate at which position changes with respect to clock time is 5 cm / second, and if the clock time changes by 10 seconds, by how much does the position change?
answer/question/discussion:
d = vt
d = 5 cm / second x 10 seconds
d = 50 cm
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This is Seed Question 1.1 with the questions attacthed.
No harm here, but in the future be sure to use the form for the question you are attaching.
Your work is good. See my one note about units. Everything else is correct and well-expressed.