Mass(adsbygoogle = window.adsbygoogle || []).push({}); m=1kg

Spring constantk=200 N/m

Unstretched spring length0.1m

When the system as show in the attatachment is realeased from rest the spring contracts. Use conservation of energy to determine the magnitude of velocity of the mass when the string and spring are parallel.

Relevant equations.

1/2 m v[tex]^{2}_{1}[/tex] + mgy + 1/2 K S[tex]^{2}[/tex] = 1/2 m v[tex]^{2}_{2}[/tex] + mgy + 1/2 K S[tex]^{2}[/tex]

The attempt at a solution.

(1/2 * 1 * 0) + (1 * 9.81 * 0) + (1/2 * 200 * ?) = (1/2 * 1 * v[tex]^{2}_{2}[/tex]) + (1 * 9.81 * ?) + (1/2 * 200 * ?)

I know the initial v=0 and the initial y=0. I'm not sure what I should what numbers to use where the "?" are. These are the final y and the S's. Can anyone help?

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# Homework Help: Conservation of Energy

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