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NEET2009PhysicsCenter of Mass, Momentum and CollisionActual

Two bodies of mass 1 ~kg and 3 ~kg have position vectors i +2 j + k and -3 i -2 j + k , respectively. The centre of mass of this system has a position vector :

Options

  1. A- i + j + k
  2. B-2 i +2 k
  3. C-2 i - j + k
  4. D2 i - j -2 k

Correct answer

C. -2 i - j + k

Step-by-step solution

R _ cm = m ₁ r ₁+ m ₂ r ₂ ~m ₁+ m ₂ =-2 i - j + k

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