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course phy 121
For each situation state which of the five quantities v0, vf, `ds, `dt and a are given, and give the value of each. •A ball accelerates uniformly from 10 cm/s to 20 cm/s while traveling 45 cm.
answer/question/discussion:
`ds = 45cm
V0= 10cm/s
Vf= 20cm/s
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• A ball accelerates uniformly at 10 cm/s^2 for 3 seconds, and at the end of this interval is moving at 50 cm/s.
answer/question/discussion:
a = 10cm/s^2
`dt = 3s
Vf= 50cm/s
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• A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
answer/question/discussion:
`dt = 30cm
V0 = 0
A = 20cm/s^2
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Then for each situation answer the following:
• Is it possible from this information to directly determine vAve?
answer/question/discussion:
for the first situation, it is possible to determine vAve, for the latter two it is not possible.
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• Is it possible to directly determine `dv?
answer/question/discussion:
yes, it is possible to directly determine the change in velocity for the first situation, but not for the second two.
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