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For a two-body collision, involving objects with different masses, a frame of reference which has the same velocity relative to the laboratory as does the center of mass of the two objects is:
Fear Darkness
An anxiety disorder or phobia characterized by an irrational fear of the dark or nighttime darkness, often stemming from the fear of the unknown.
Evolutionary Psychology
A psychological theory that explores human cognition and actions by considering the principles of natural selection and adaptation.
Genetically Predisposed
Having an inherited tendency or vulnerability to develop certain traits or conditions based on one's genetic makeup.
Biologically Related
Pertaining to beings who share genetic material or have a familial genetic connection.
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