The mass of the disk is 45 kg, and its radius is R = 0.3 m. The spring constant is k = 600...

The mass of the disk is 45 kg, and its radius is R = 0.3 m. The spring constant is k = 600 N/m. The disk is rolled to the left until the spring is compressed 0.5 m and released from rest.

(a) If you assume that the disk rolls, what is its angular acceptation at the instant it is released?

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(b) What is the minimum coefficient of static friction for which the disk will not slip when it is released?