A Satellite Having Orbital Speed V Orbits a Planet

Multiple Choice

A satellite having orbital speed V orbits a planet of mass M . If the planet had half as much mass, the orbital speed of the satellite at the same distance from the center would be

A) V .
B) 2V
C) V/2 .
D) $V / \sqrt { 2 }$
E) $V \sqrt { 2 }$