A satellite of mass `5M` orbits the earth in a circular orbit. At one point in its orbit, the satellite explodes into two pieces, one of mass `M` and the other of masses `4M`. After the explosion the mass `M` ends up travelling in the same circular orbit, but in the opposite direction. After explosion the mass `4M` is
A. In a circular orbit
B. unbounded
C. elliptical orbit
D. data is insufficient to determine the nature of the orbit
