The mass, m, in the following illustration is guided by the frictionless rail and has a mass of 40 kg. The spring constant, k, is 3000 N/m.

The mass, m, in the following illustration is guided by thefrictionless rail and has a mass of 40 kg. The spring constant, k, is3000 N/m. The spring is compressed sufficiently and released,such that the mass barely reaches point B. Note that the spring isshown in the compressed position in the figure.a. What is the initial spring compression?b. What is the kinetic energy of the mass at point A?c. What is the velocity of the mass at point A?d. What is the energy stored in the spring if the spring iscompressed 0.5 m?