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A angular positio of a point on the rim...

A angular positio of a point on the rim of a rotating wheel is given by `theta=4t-3t^(2)+t^(3)` where `theta` is in radiuans and `t` is in seconds. What are the angualr velocities at
(a).`t=2.0` and
(b). `t=4.0s`
(c). What is the average angular acceleration for the time interval that begins at `t=2.0s` and ends at `t=4.0s`?
(d). What are the instantaneous angular acceleration at the biginning and the end of this time interval?

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