The eight figures below show spheres that have been thrown horizontally, i. e., straight out, off cliffs. All of the spheres are the same size and have the same mass, but they are thrown at different speeds off cliffs of
different heights. The specific speeds and heights are given in each figure.
1
2
Rank these spheres from longest to shortest on the basis of how long they take to reach the ground. That is,
put first the spl ere that takes the most time in the air, and put last the sphere that takes the shortest time
in the air.

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.

It equals just about 6,300 km per hour each day an week