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## Homework Statement

A light spring has unstressed length 15.5cm.It is described by Hooke's law with spring constant 4.30N/m.One end of the horizontal spring is held on a fixed vertical axle,and the other end is attached to a punk of mass that can move without friction over a horizontal surface.The punk is set into motion in a circle with a period of 1.30s.

Find the extension of the spring x as it depends on m.

## Homework Equations

## The Attempt at a Solution

Firstly,I found the velocity of the punk.

1/2kx

^{2}=1/2mv

^{2}

v=[(4.3x

^{2})/m]

^{1/2}

But I don't know what is the next step.