3.) A cart of mass 0.350 kg is attached to the end of a frictionless horizontal air track by a spring having a spring constant of 10.5 Him. The cart is originally displaced 5.00 cm from its equilibrium position and begins oscillating lightly on track. Find: a) The inilial total energy of the oscillating system b) cart's maximum speed c) cart's speed when located 3.00 cm from its equilibrium position