cq_1_61

phy 201

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: 10cm/s= v0 20cm/s=vf 45cm=`ds

• 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: 10cm/s^2=a 3s=`dt 50cm/s=vf

• A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.

answer/question/discussion: 30cm=`ds 20cm/s^2=a

Then for each situation answer the following:

• Is it possible from this information to directly determine vAve?

answer/question/discussion: situation 1: yes, you would add v0 and vf, then divide by 2. Sit.2: it would be possible, but not directly. You would have to find `dv by multiplying a and `dt, then take that value and find v0. Then you could take the average of v0 and vf to get vAve. Sit. 3: no, it would not be possible without the `dt value.

• Is it possible to directly determine `dv?

answer/question/discussion: sit. 1: yes, you would subtract v0 from vf to get `dv. Sit. 2: yes, you would e able to find `dv by multiplying `dt with a. Sit. 3: no, you would not be able to because the `dt value is not given.

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hard to tell, left and came back several times, but probably 15 min.

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&#This looks good. Let me know if you have any questions. &#