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What speed will the alpha-particle have after the collision

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A proton, of mass m, at rest, is struck head-on by an alpha-particle (which consists of 2 protons and 2 neutrons) moving at speed v. If the collision is completely elastic, what speed will the alpha-particle have after the collision? (Assume the neutron's mass equals the proton's mass.). Hint: collision is elastic - Mechanical energy is conserved (What kind of mechanical energy?) 

Reference no: EM131847039

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