Lexy used the formula shown to calculate the force of gravity on a space shuttle. fg = g what does 3 × 105 kg represent? the difference between earth’s mass and the space shuttle’s mass the sum of earth’s mass and the space shuttle’s mass the mass of earth the mass of the space shuttle

This term shows the mass of the space shuttle

We know that the mass of the Earth is 5.972 × 10^24 kg. Similarly the sum of  mass of earth and the mass of shuttle must be a greater number as compared to the number given. It simply means that the mass of earth is itself 5.972 × 10^24 kg and the value given is 3 × 105 kg so it is obvious that if was the sum then it must be greater than the mass of earth. Therefore we can say that this not the mass of earth, neither the sum of mass of earth and shuttle, but this is only the mass of space shuttle which is the last multiple choice.