My physics teacher teach this when we watch the video on Bungy Jump :
G.P.E + E.P.E + K.E = CONSTANT
G.P.E = Gravitational Potential Energy = mgh
K.E = Kinetic Energy = (1/2)mv2
E.P.E = Elastic Potential Energy = (1/2)kx2
Why F.4 teach this .......
Who can tell me more about E.P.E ?