$A$ body of mass $20 \ kg$ moving with a velocity of $10 \ m/s$ collides with a stationary body of mass $5 \ kg$ and sticks to it. The combined kinetic energy of the system after the collision is . . . . . . $J$.

  • A
    $600$
  • B
    $800$
  • C
    $1000$
  • D
    $1200$

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