SHM:Phase
Here is an oscillating ball. 

Recall: x(t) = A cos (w t) 

What phase is the ball in when:
    x = +A, v = 0
     
A. 0.00 p rad
B. 0.25 p rad
C. 0.50 p rad
D. 1.0 p rad
E. 1.5 p rad
F. 1.7 p rad

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