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Determining constant angular acceleration

Assignment:

At t=3s, a point on the rim of a .2m radius wheel has a tangential speed of 50m/s as the wheel slows down with a tangential acceleration of constant magnitude 10m/s^2.

a) What is the constant angular acceleration?
b) What is the angular velocities at t=3s & t=0s
c) Through what angle did the wheel turn between t=0s & t=3s?
d) At what time was the radial acceleration equal to g?

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