A mass of 0.04 kg can glide freely on an air track. It is attached to a spring (k=144 N/m) and oscillates back and forth with an amplitude of 0.5 m.
Find the kinetic energy at a distance of 0.05 m from the equilibrium?
At t=0, the mass is found in the equilibrium position x=0 with a velocity of 30 m/s to the right, describe the correct equation of motion?