Two satellites orbit the Earth in circular orbits of the same radius. One satellite is twice as massive as the other. Which of the following statements is true about the speeds of these satellites?
(a) The heavier satellite moves twice as fast as the lighter one.
(b) The two satellites have the same speed.
(c) The lighter satellite moves twice as fast as the heavier one.
(d) The heavier satellite moves four times as fast as the lighter one.
