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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.
v0=10 cm/s
vf=20 cm/s
'ds=45cm
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.
a= 10 cm/s^2
'dt= 3 seconds
vf=50 cm/s
A ball travels 30 cm along an incline, starting from rest, while accelerating at 20 cm/s^2.
'ds= 30 cm
a= 20 cm/s^2
v0=0
Then for each situation answer the following:
Is it possible from this information to directly determine vAve?
1st one: Yes, you can by figureing out 'dt, then using 'dt= 10/3.3333= 3 , then using vAve='ds/'dt=15 cm/s
2nd one: No, I don't think so I don't have v0 or 'ds
You can find `dv from a and `dt, then subtract `dv from vf to find v0. Then it's easy to find vAve and `ds.
3rd one: No, but it should be a way to figure it out if you could get the vf, by using vf^2 = v0^2 + 2 a `ds
Is it possible to directly determine `dv?
1st one: yes, the answer is 10 cm/s
2nd one: Yes, you can do 'dv= a * 'dt, which equals = 30 cm/s
3rd one: No, I don't thinks so
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40 minutes
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