Question

if a cannon is fired from the front of a boat, the boat will drift backward. which on of Newton's laws best describes this motion?

Newton's second law of motion: force is equal to mass time acceleration

Newton's third law of motion: for every action, there is a equal and opposite reaction

Newton's first law of motion: an object in motion stays in motion unless acted on by another force

Answer 1

Newton's Third Law: For every action, there is an equal and opposite reaction. 

The cannon jumps back which pushes the boat backwards.