Seed 61

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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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