A baseball is hit straight up into the air with a speed of 22m/s. How high does it go?

What is the measurement of how fast an object moves relative to a reference point?

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?

What happens to an isotope during radioactive decay?