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3. A lonely particle is produced on a star 10 light-years away from the earth. It has a lifetime of 2 years and traveis toward

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3. A lonely particle is produced on a star 10 light-years away from the earth. It has a lifetime of 2 years and traveis toward the earth. The particle decays as soon as it reaches the earth. What is the speed of this particle with respct to the earth's frame? [10 marks]

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