What is the force that every mass experts on every other mass called?

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.

snell's law

refractve index = sin incidence / sin refraction

the right answer is 0.3 meters per second