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**[SOLVED] Angular motion with constant acceleration**

**1. Homework Statement**

**2. Homework Equations**

[tex]\varpi[/tex]= [tex]\varpi[/tex](inital) + [tex]\alpha[/tex]t

**3. The Attempt at a Solution**

I understood part A and Part b,

What I don't understand is how to do Part C.

What I did was divide the average angular velocity with acceleration. But I don't get why or a more understanding method to do this problem