How does the velocity of the ball change when it bounces on the floor

If you kick the ball, it gives it kinetic energy and makes it move.

Step-by-step explanation: If the ball was originally kicked, you gave Kinetic Energy to the ball causing it to move and change its 'VELOCITY'. It a simpler form, if you kick the ball, you change its speed(velocity) and make it move.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.