Consider an object with weight on the earth w_earth. the gravity of the earth is g. if it is moved to another planet with gravity a, how much will be its weight? note: you don't need to put a number for variables, m, w, a, g

W_planet=(W_earth*a)/g

Explanation:

The mass of the object does not change. It is the same at Earth and at the other planet.

W_earth=Mg       weight at Earth

W_planet=Ma       weight at other planet

If we divide the last equations:

W_planet/W_earth=a/g

W_planet=(W_earth*a)/g

real, smaller and upside-down.   so the answer should be b.