cq_1_051

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Phy 231

Your 'cq_1_05.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

** CQ_1_05.1_labelMessages **

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: ->->->->->->->->->->->-> scussion:

Each second, velocity increases by 8 cm/s. So I need to multpily 8cm/s by 3 seconds, for a change in velocity of 24cm/s. Add this to the initical velocity of 8cm/s, for a final velocity of 36cm/s.

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

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

Average velocity is (initial velocity + final velocity)/2. Here, that's (12cm/s+36cm/s)/2, or 24cm/s.

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How far will it travel during this interval?

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

`Ds=(vAve)(`dt)

=(24cm/s)(3s)

=72cm

The ball will travel 72cm during the 3-sec interval.

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