Question #4193

A particle makes a head-on-collision with an unknown particle at rest.The proton rebounds back with 4/9 of its initial kinetic energy.Find the ratio of mass of unknown particle to mass of proton assuming the collision to be elastic.

Expert's answer

Where m1 - mass proton, m2- mass unknown particle, V1- initial speed of proton, V1' - speed of proton after collision, V2 - speed of unknown particle after collision.

Or

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