Which of the following best describes newton's first law of motion? (more than one answer applies)

f=m • a

a swimmer turns and kicks off from the end of the pool.

a book will slide across the desk if you exert a force on it.

an object in motion will remain in motion in the same direction and at a constant speed unless another force acts on it.

law of inertia

shows the relationship between mass, force and acceleration.

for every action there is an equal and opposite reaction.

when a hammer strikes a nail, the nail exerts a force back on the hammer.