A body A of mass m, is moving in a circular orbit of radius R, around a planet. Another body B, of mass m/2, collides with A with a velocity which is half (v/2) the instantaneous velocity v of A. The collision is completely inelastic. Then, the combined body:
A. continuous to move in a circular orbit.
B. escapes from the Planet's Gravitational field.
C. falls vertically downwards towards the planet.
D. starts moving in an elliptical orbit around the planet.
