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A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are

a) the constant angular acceleration (in rad/s2) and

b) the angular displacement (in rad) of each wheel?

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