option c...have the waves move thru the vacuum or space
You get the net force acting on it ... the sum of the strengths and directions
of all the individual forces there may be.
Answer:

Explanation:
Given that,
Mass of a boy is 78 kg
Mass of a girl is 65 kg
We need to find the force of gravitational attraction between them if they are 2 m away.
The formula for the gravitational force is given by :

So, the force between them is
.