A spring is stretched by 0.2 m when a mass of 0.5 kg is suspended to it. The time period of the spring when 0.5 kg mass is replaced with a mass of 0.25 kg is suspended to it is (Acceleration due to gravity $=10 \mathrm{~m} \mathrm{~s}^{-2}$ )

• Correct answer
  A

  0.628 s
• B

  6.28 s
• C

  62.8 s
• D

  0.0628 s

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