cq_1_051

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PHY 121

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The problem:

A ball accelerates at 8 cm/s^2 for 3 seconds, starting with velocity 12 cm/s.

What will be its velocity after the 3 seconds has elapsed?

answer/question/discussion: ->->->->->->->->->->->-> :

If it is accelerating at 8 cm/s^2 for 3 seconds, you multiply 8 cm/s^2 * 3 s and get 24

cm/s for these 3 seconds. Then you have to add the 24 c/s to the initial velocity of 12

c/s for a final velocity during this time of 36 cm/s.

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Assuming that acceleration is constant, what will be its average velocity during this

interval?

answer/question/discussion: ->->->->->->->->->->->-> :

To find the average velocity, you have to average the initial and final velocities,

which would be (12 cm/s + 36 cm/s)/2 = 48 cm/s / 2 = 24 cm/s

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How far will it travel during this interval?

answer/question/discussion: ->->->->->->->->->->->-> :

The average veolcity is 24 cm/s times the elapsed time of 3 seconds for a total of 72

cm.

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&#Very good responses. Let me know if you have questions. &#