cq_1_031

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):

6cm/s 30/5

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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):

12cm/s

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• By how much did its velocity therefore change?

answer/question/discussion (start in the next line):

changed by 12. Started at 0 and ended at 12

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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):

12/5= 2.4cm/s

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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):

It would have a slope of 2.4 because it changes 2.4 cm per second. So the line would be constant

Good. However all quantities with units should be expressed in terms of those units.

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Solution

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