The bob $A$ of a simple pendulum is released when the string makes an angle of $45^{\circ}$ with the vertical. It hits an other bob $B$ of the same material and same mass kept at rest on the table. If the collision is elastic

• A

  both $A$ and $B$ rise to the same height
• B

  both $A$ and $B$ come to rest at $B$
• C

  both $A$ and $B$ move with the same velocity of $A$
• Correct answer
  D

  $A$ comes to rest and $B$ moves with the velocity of $A$

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