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## Homework Statement

A crest is created on a string by vibrating it. The crests have two periods on the string which is 3 m long. At what point will the crest have an

**acceleration**of zero?

I had gotten this problem from a science competition and really had no idea how to do it. But I assumed that the vibrations would make a sine curve and the place where acceleration is zero would be where [tex] \frac {d^{2}}{dx^{2}} \sin {x} = 0 [/tex]

Thereby I calculated an answer of .75m, but could someone clarify this for me?

## Homework Statement

## Homework Equations

## The Attempt at a Solution

.75m

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