A ball of mass $\mathrm{m}$ suspended from a rigid support by an inextensible massless string is released from a height $\mathrm{h}$ above its lowest point. At its lowest point it collides elastically with a block of mass $2 \mathrm{~m}$ at rest on a frictionless surface. Neglect the dimensions of the ball and the block. After the collision the ball rises to a maximum height of $-$

• A

  $\mathrm{h} / 3$
• B

  $\mathrm{h} / 2$
• C

  $\mathrm{h} / 8$
• Correct answer
  D

  $\mathrm{h} / 9$

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