Two simple pendulums of length 1 m each, with bobs having masses 1 kg and 2 kg, are hanging from the ceiling of an elevator. The elevator starts moving vertically downwards with acceleration \(g / 10\). Assuming \(g=10 \mathrm{~m} / \mathrm{s}^2\), approximately what are the time periods of the two pendulums?

• A

  2.1 s and 3.0 s
• B

  2.1 s and 2.1 s
• Correct answer
  C

  1.9 s and 1.9 s
• D

  1.9 s and 2.7 s

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