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Seed q 5
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:
a = 8 cm/s/s
dt = 3 s
v1 = 12 cm/s
dv = a * dt
vf = v1 + (a*dt)
vf = 12 cm/s + (8cm/s/s * 3s)
vf = 12 cm/s + 24 cm/s = 36cm/s
Assuming that acceleration is constant, what will be its average velocity during this interval?
answer/question/discussion:
v1 = 12 cm/s
vf = 36 cm/s
vAve = (v1+vf)/2
vAve = (12cm/s + 36cm/s) /2
vAve = 48 cm/s / 2 = 24 cm/s
How far will it travel during this interval?
answer/question/discussion:
ds = vAve * dt
Ds = 24cm/s * 3s = 72cm
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15 minutes
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