A low-friction cart of mass 5.0 kg is attached to the spring. The spring is stretched 1.5 m from its equilibrium length, and then the cart is released. The graph on the right is of the force exerted by a spring as a function of the distance it is stretched from its unstretched length.
A - What is the spring constant of this spring?
B - What is the elastic potential energy if the spring is stretched 1.5 m from its equilibrium length?
C - What is the kinetic energy of the cart just as the spring passes through its equilibrium length? What is the velocity of the cart at this position?