1. The problem statement, all variables and given/known data A spring of mass m is pulled away from the centre from its two ends with a velocity v at a particular instant.Find its kinetic energy. 2. Relevant equations KE=.5kx2 is useless since k is not given but m is given So i think i will have have to use .5mv2 3. The attempt at a solution the velocity of the spring will gradually decrease and will become 0 at the centre. if v(x) is the velocity at a particular distance from the centre then we can write kinetic energy=1/2 m/l*dx*v(x)2(dx being a small distance x) and then integrate to find KE. i am unable to find v(x) as a function of x.