9.3: a) . s rad 42 s, 3.5 at so , ) s rad (12.0 2 3 = = = = α t t dt dω α z z The angular acceleration is proportional to the time, so the average angular acceleration between any two times is the arithmetic average of the angular accelerations. b) , ) s rad (6.0 2 3 t ω z = so at
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