Three spaceships A,B,and C are in motion,as shown in the figure.The commander on ship B observes ship C approaching with a relative velocity of 0.78c.The commander also observes ship A,advancing in the rear,with a relative velocity of 0.31c.What is the velocity of ship C,relative to an observer on ship A? 
Definitions:
Human Mating
The process through which individuals seek out and establish a partnership that may lead to reproduction and/or a long-term romantic relationship.
Evolutionary Perspective
An approach focusing on how evolutionary theory informs our understanding of human thoughts, feelings, and behaviors.
Collectivism
Giving priority to group goals (often those of the extended family or work group) and defining one’s identity accordingly.
Personal Space
The buffer zone we like to maintain around our bodies.
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