Does force come in pairs?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.