Scientists once believed that protons, electrons, and neutrons were the smallest particles of matter. Now they believe that these particles are made of even smaller particles.
WILL MARK BRAINLIEST. 30 POINT QUESTION. PLZ HELP
Which statement gives one of the reasons the original belief was a theory?
It was not based on tests or observations.
It was a factual statement based on a hypothesis.
O It did not explain what matter is actually made of.
It was a widely accepted explanation of the structure of matter.

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

Sound energy is produced when an object vibrates. examples are 1- a balloon popping2-a whistle3- a waterfall

Indoraptor for sure