A mass of 3.75kg is permanently attached to a spring. The spring has a spring constant K, of 2000 N/m. The doing is attached 0.09 m to the right and then released from the rest on a horizontal frictionless surface

a) What is the total energy of the mass-spring system before it starts oscillating ?

b) What is the speed of the mass as it moves through the equilibrium position ( the point where the spring is neither stretched nor compressed)?

c) Find the distance the doing is stretched when the mass is moving at 1.4 m/s