Three balls are moving along a straight line having the instantaneous positions shown in the figure. At that instant, find the location and velocity of the center of mass (or center of gravity) of this system. 
Definitions:
Second Right Answer
Refers to a method of decision making in which people get rid of the stumbling block that prevents them from looking for more than one solution.
Bob Eberle
An author known for his work on creativity, especially in educational settings, and for developing the SCAMPER technique as a creative thinking tool.
Brainstorming Process
A creative group activity designed to generate a large number of ideas or solutions for a specific problem or question within a limited time frame.
Hitchhiking
The act of traveling by getting free rides from passing vehicles, typically by standing at the side of the road and thumbing or signaling to drivers.
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