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Center of Mass question

2018 · 15 Apr · Shift 2 · Q65
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Center of Mass question

2018 · 15 Apr · Shift 2 · Q65

JEE MainPhysicsCenter of MassMCQ+4 / −1
A proton of mass m collides elastically with a particle of unknown mass at rest. After the collision, the proton and the unknown particle are seen moving at an angle of 90o with respect to each other. The mass of unknown particle is :
  1. A
    m2{m \over 2}2m​
  2. B
    m
  3. C
    m3{m \over {\sqrt 3 }}3​m​
  4. D
    2 m
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