ph121
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Seed Question 5.1
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:
12cm/s + (8 cm/s^2 * 3 s) = v
12 cm/s + 24 cm/s = v
V = 36 cm/s
• Assuming that acceleration is constant, what will be its average velocity during this interval?
answer/question/discussion:
(12 cm/s + 36 cm/s) 2 = vAve
48 cm/s / 2 = vAve
vAve = 24 cm/s
• How far will it travel during this interval?
answer/question/discussion:
24 cm/s * 3 s = ‘ds
‘ds = 72 cm
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5 min
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