if you were to fill a graduated cylinder to 250 mL then drop an object in that raises the water level to 300 mL, what is the volume of the object, in cubic centimeters?

50cc. The conversion rate is 1ml to 1cc so you simply subtract the level in the cylinder before the object (250ml) from the level after dropping in the object (300ml) to find the difference, or the change. And then you multiply that figure by a factor of one because 1ml is equal to 1cc.

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.