To run the simulation, you will alter mass in creating momentum of the carts. The total mass of the carts in the
collision is the
variable.
The velocity of the combined carts after the collision will change because of the change in the independent variable.
In this way, the final velocity is the
variable.

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

What kind of enegia produces the mixture of bicarbonate and vinegar  chemical producetion