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Work, Power and Energy: Kinetic Energy — Relative MCQ

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Kinetic Energy — RelativeMediumQuestion 30456

Question

Two equal masses (m) move toward each other at equal speeds v. The total KE in the centre of mass frame is:
  1. A
    mv²
    Correct
  2. B
    ½mv²
  3. C
    0
  4. D
    2mv²

Correct answer

mv²

Explanation

In the CM frame, both masses move at speed v (inward). KE = 2×½mv² = mv².

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