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## Homework Statement

A particle executes simple harmonic motion with an amplitude of 2.51cm. At what positive displacement from the midpoint of its motion does its speed equal one half of its max speed?

## Homework Equations

A=2.51 cm

x(t) = Acos(wt)

v(t) = -Awsin(wt)

v

_{max}= |-Aw|

## The Attempt at a Solution

I just want to know how to find w so I can plug it into the v

_{max}equation.