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**1. Homework Statement**

An object in SHM oscillates with a period of 4 s and an amplitude of 10 cm. How long does the object take to move from x= 0 cm to x=6 cm?

**2. Homework Equations**

**3. The Attempt at a Solution**

I think I should use the formulas

v(t)= -omega*Asin(omega*t + phase constant)

x(t) = Acos(omega*t + phase constant)

But once again, I cannot find the phase constant and I do not understand the physical meaning of the phase constant. I really am having a lot of difficulty with these types of problems.