Deep space, sphere A of mass 20kg is located at the origin of an x axis and sphere B of mass 10 kg is located on the axis at x = 0.80 m. Sphere B is released from rest while sphere A is held at the origin.
(a) What is the gravitational potential energy of the two-sphere system just as B is released?
(b) What is the kinetic energy of B when it has moved 0.20 m toward A?