Two clastic strings. ab and a'b', have the same natural length / and the same modulus of elasticity. the ends a and a' are attached to two fixed points in the same vertical line, with 4 a distance i above a'. the ends b and b' are both attached to a particle p of mass m. when phangs freely, both strings are extended. show that mig > .. the particle is pulled down a distance d below its equilibrium position and then released from rest. given that in the subsequent motion both strings remain taut, show that 2d2 < img - 2). given also that 2 = mg/3, find the potential energy stored in cach string when p is at its lowest position in the above motion.