Mass of moon is $7\cdot 34\times {10}^{22}\mathrm{kg}$ If the acceleration due to gravity on the moon is $1\cdot 4\mathrm{m}/{\mathrm{s}}^2$ the radius of the moon is $\left(\mathrm{G}=6\cdot 667\times {10}^{-11}{\mathrm{Nm}}^2/{\mathrm{kg}}^2\right)$

• A

  0.56 x 10⁴m

• B

  1.87x10⁶m

• C

  1.92 x 10⁶ m

• D

  1.01x10⁸m