A disc of mass $M$ and radius $R$ rolls without slipping on a horizontal surface (see figure).




If the speed of its centre is $v_0$, then the magnitude of the angular momentum of the disc about a fixed point P at a height $5 R / 2$ above the horizontal surface

• A

  increases continuously as the disc moves away from P until it attains a constant value $\frac{5}{2} M v_0 R$.
• B

  decreases continuously as the disc moves away from P until it attains a constant value $\frac{3}{2} M v_0 R$.
• Correct answer
  C

  is constant and equal to $M v_0 R$.
• D

  is constant and equal to $2 M v_0 R$.

Hence, the correct answer is option: 'C'.