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A particle executes simple harmonic motion with an amplitude of 2.25 cm. At what position does its speed equal half its maximum speed?

I've been looking at this for a while, and I cant see how to solve it without more information.

If I knew the energy and mass I could solve it,

if I knew the frequency or period I could solve it,

if I knew the spring constant and mass I could solve it,

but I dont have any of this, what's the trick?

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# Homework Help: Oscillary Motion

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