A mass attached to a spring is pulled a distance A from the equilibrium position and released from rest. It then undergoes SHM. When the mass is A/2 from equilibrium, how is the energy divided between potential and kinetic?
The total energy is ½
kA2. At x = A/2 the spring potential energy is ½ kx2 = kA2/8, which
is 25% of the total energy.