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## Homework Statement

The total energy of a spring-mass system oscillating horizontally is 1600 J. What will be the kinetic energy (in joules) of the mass when its displacement is one-fourth of its amplitude?

## Homework Equations

total energy = KE + PE = .5kA

^{2}

KE = .5mv

^{2}

PE = .5kx

^{2}

## The Attempt at a Solution

All I have written down is-

1600 J = .5kA

^{2}

So, I have no idea how to start solving this problem. Can anyone help me get started? Any help is appreciated!