Martians have decided to disrupt a space flight to the moon by building a flat, frictionless invisible plane between the space capsule and the earth. When the capsule attempts to go back to earth, it gets stuck on the plane and shuts off its engines. Define the x-axis to be along the plane and put the origin at the nearest point to the earth. Assuming the space capsule lands at x0 > 0 with initial velocity zero, what happens to the space capsule?