A 0.359-kg mass is attached to a horizontal spring with k = 108 N/m. The mass slides across a frictionless surface. The spring is stretched 21.5 cm from equilibrium, and then the mass is released from rest.
a) Find the mechanical energy of the system.
b) Find the speed of the mass when it has moved 4.85 cm.
c) Find the maximum speed of the mass.