An astronaut throws a rock. the rock travels through outer space at a constant velocity. which statement applies to the motion of this rock? a- an unbalanced force is acting on the rock, causing it to accelerate. b-the rock will undergo constant acceleration until a force acts on it. c- the rock will continue on its current path until an unbalanced force acts on it. d- the force that makes the rock move through space is equal to its mass divided by its velocity