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a) How much work must be done on a particle with a mass of m to accelerate it from rest to a speed of 8.4×10−2 c ? (Express the answer in terms of mc^2.)

b)How much work must be done on a particle with a mass of m to accelerate it from a speed of 0.900c to a speed 0.984 c ? (Express the answer in terms of mc^2.)

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