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physics

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A proton (mass=1.67*10^-27 kg) moves with a velocity of 6.00*10^6 m/sec. Upon colliding with a stationary particle of unknown mass, the proton rebounds upon its own path with a velocity of 4.00*10^6 m/sec. The collision sends the unknown particle forward with a velocety of 2.00*10^6 m/sec. What is the mass of the unknown particle.

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    Shy1236mg

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