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## Homework Statement

A mass is oscillating on a spring with a period of 4.85 s. At t = 0 the mass has zero speed and is at x = 9.90 cm. What is the magnitude of the acceleration at t = 1.40 s?

## Homework Equations

a=-w

^{2}x

x(t)=Acos(wt+phi)

## The Attempt at a Solution

I tried using the equation for acceleration by solving for w in the equation dealing with position, but I don't have the phase change constant, and otherwise I have no idea how to begin going about this problem. I need a push in the right direction!

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