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phy121
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: ->->->->->->->->->->->-> :
Since the ball is already moving at 12cm/s, we know that at each second, the ball is accelerating another 8cm/s. Therefore, after 3 the velocity of the ball would be:
8cm/s^2= (v_f-12cm/s) / 3s
8cm/s^2*3s= v_f - 12cm/s
24cm/s+12cm/s= v_f
V_f= 36cm/s
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• Assuming that acceleration is constant, what will be its average velocity during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
average velocity= (v_0+v_f) / 2
vAve= (12cm/s+36cm/s) / 2
vAve= 48cm/s / 2
vAve= 24cm/s
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• How far will it travel during this interval?
answer/question/discussion: ->->->->->->->->->->->-> :
vAve=’ds/’dt
‘ds= vAve*’dt
‘ds= 24cm/s*3s
‘ds= 72cm
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&#Very good responses. Let me know if you have questions. &#