A body is released from a height of $30 \mathrm{m}$ vertically downwards. The speed of the body at which potential energy is twice that of kinetic energy is (Acceleration due to gravity $=10 \mathrm{m} {\mathrm{s}}^{-2}$)

• A

  $20\sqrt{2} \mathrm{m} {\mathrm{s}}^{-1}$
• Correct answer
  B

  $10\sqrt{2} \mathrm{m} {\mathrm{s}}^{-1}$
• C

  $10 \mathrm{m} {\mathrm{s}}^{-1}$
• D

  $20 \mathrm{m} {\mathrm{s}}^{-1}$

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