course Phy121
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What are the average acceleration and final velocity of an object which accelerates uniformly from rest, traveling a distance of 69 cm from start to finish and ending up with a velocity of 18.1 cm/sec? Final velocity of the object is provided, 18.1
Since it is accelerating uniformly, and starting from rest,
vAve is vf-v0/2 9.05 cm/s
We can use the expression for finding vAve to find `dt.
vAve = `ds/`dt or `dt = 69cm/9.05 cm/s
`dt = 7.62s
With this information, we can find average acceleration, since it is found from `dv/`dt
18.1 cm/s / 7.62 s = 2.37 cm/s^2
Very good. Let me know if you have questions.