A proton makes a head-on collision with an unknown particle at rest. The protonrebounds straight back with 4/9 of its initial kinetic energy. Find the ratio of the mass ofthe unknown particle to the mass of the proton, assuming that the collision is elastic.Hints: The proton has mass m, and the unknown particle hasmass M. The upper sketch is before the collision, and thelower sketch is after the collision. Both momentum P andmechanical energy (kinetic energy K) are conserved in theelastic collision.VM

Given Data The mass of proton is:m The mass of unknown particle is:M To find: The ratio of the…

Answered: A proton makes a head-on collision with…

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