The gravitational field of a planet or spherical astronomical ... ...

   The gravitational field of a planet or spherical astronomical body depends on its mass and on its radius. When the Moon is compared to Earth, its smaller mass makes for a smaller gravitational field, while its smaller radius favors a larger one. The net effect is that the gravitational field of the Moon at its surface is one sixth that of the Earth. A 10,000-kg mobile unit is transported to the Moon. What is its mass on the Moon?
(A) 1/36 (10,000) kg
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 02. The Language of Motion