1. The problem statement, all variables and given/known data 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. 2. Relevant equations 3. The attempt at a solution Firstly,I found the velocity of the punk. 1/2kx2=1/2mv2 v=[(4.3x2)/m]1/2 But I don't know what is the next step.