$A$ uniform heavy disc is rotating at a constant angular velocity $\omega$ about a vertical axis through its centre and perpendicular to the plane of the disc. Let $L$ be its angular momentum. $A$ lump of plasticine is dropped vertically on the disc and sticks to it. Which of the following quantities will remain constant?

  • A
    $\omega$
  • B
    $\omega$ and $L$ both
  • C
    $L$ only
  • D
    Neither $\omega$ nor $L$

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