What is the difference between velocity, speed, and acceleration, and how are they used in real life?

If two students are running down the hall toward each other, trying to get to class, and they have the same mass and acceleration, what will happen when they collide? will their forces cancel out or will each one experience a reaction?

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.

The movement of electrons between atoms is called an