An object is propelled vertically to a maximum height of $4 \mathrm{R}$ from the surface of a planet of radius $\mathrm{R}$ and mass $\mathrm{M}$. The speed of object when it returns to the surface of the planet is

• Correct answer
  A

  $2 \sqrt{\frac{2 G M}{5 R}}$
• B

  $\sqrt{\frac{G M}{2 R}}$
• C

  $\sqrt{\frac{3 G M}{2 R}}$
• D

  $\frac{G M}{5 R}$

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