A pendulum has maximum kinetic energy $K_1$ . If its length is doubled keeping amplitude same then maximum kinetic energy becomes $K_2$ . Then relation between $K_1$ and $K_2$ is:

• Correct answer
  A

  $K_2=2K_1$
• B

  $K_1=2K_2$
• C

  $K_2=K_1$
• D

  $K_1=4K_2$

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