A horizontal spring with a spring constant of 0.6 N/m sits on a frictionless table. It has an equilibrium length of 18 cm. A mass of 20 grams is attached and you stretch the spring to a total length of 21 cm. The mass is then released from rest.
a) What is the magnitude of the elastic force on the mass just after it is released?
____________ N
b) What is the magnitude of the acceleration of the mass just after it is released?
____________ m/s2