Question

A disk rotates at constant angular acceleration, from angular position ?1 = 10.0 rad to angular…

A disk rotates at constant angular acceleration, from angular position θ1 = 10.0 rad to angular position θ2 = 69.0 rad in 6.10 s. Its angularvelocity at θ2 is 15.0 rad/s.

a) What was its angular velocity at θ1?

b)What is the angular acceleration?

c) At what angular position was the disk initially at rest?

I found part a to be 3.34 rad/sec, and part b to be 1.75 rad/s2 , but I don't know how to find part c.

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