Posted by **Tory** on Sunday, April 4, 2010 at 11:45pm.

A mass attached to a spring oscillates with a period of 3.15 s.

If the mass starts from rest at x = 0.0530 m and time t = 0, where is it at time t = 6.69 s?

I found online that you use the equation x = Acos(2pi*t/T) where A is the amplitude, t is 6.69s and T is 3.15s but I keep getting the wrong answer so I don't know if Im just plugging it in wrong or not. The answer I got was 0.05156m

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