To calculate the gravitational force between two objects, you need:
- The mass of the two objects (m1 and m2)
- The distance between the two objects (r)
Thus, the correct answer is:
- the mass of the two objects and the distance between the two objects.
These components are used in the formula for gravitational force (Newton's law of universal gravitation):
\[ F = G \frac{m_1 m_2}{r^2} \]
where \( F \) is the gravitational force, \( G \) is the gravitational constant, \( m_1 \) and \( m_2 \) are the masses of the two objects, and \( r \) is the distance between their centers.
None of the options exactly match the complete requirement, but the first and last points are key elements in determining gravitational force.