1. The problem statement, all variables and given/known data An elastic string with modulus of elasticity=12. Natural length= 0.5m. Mass of ball attached to the end of the string=0.5kg. The other end of the string is fixed at point P. The particle is pulled down until it is 1.5m below P. Find the kinetic energy of the particle when it is 0.5m above P. 3. The attempt at a solution The previous question asked me to prove the KE when the string was slack and I got 7.1J, I'm not sure if that is of any relevance when working out this question. I'm confused as to what the extention is when working out the EPE or if there even is one. Any help will be greatly appreciated!