The mass of pluto was not known until it was discovered tohave
a moon. explain how this discovery enabled an estimate ofpluto's
mass.

M is mass of pluto

Explanation:

we know that gravitational force between moon and Pluto can be derived by using the given relation

here

G-gravitational constant =

M- mass of pluto

m -  mass of moon

r - radius of moon - 1737.1 km

F_{gravitational} = centripetal force

where

- angular speed of moon

plugging all value in the above equation to get the mass of Pluto

M is mass of pluto

the answer is a)

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