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Posted by on Friday, September 2, 2011 at 9:30am.

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.

  • physics - , Wednesday, December 10, 2014 at 5:40pm

    9/45

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