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Object A moves toward Object B, whose mass is twice that of Object A and which is initially at rest. After these two objects impact, they lock together and move with what fraction of Object A’s initial kinetic energy?

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Interesting fact:

Did you know that we humans are bioluminescent from metabolic reactions? Too bad our glow is 1,000 times weaker than our eyes can perceive, making it impossible for us to see this with the naked eye.