Atennis ball is hit into the air with a racket. when is the ball’s kinetic energy the greatest? ignore air resistance. a. when it leaves the racket b. just before it reaches the ground c. when it reaches its maximum height d. when its kinetic energy and potential energy are equal e. just before it starts falling downward

B. just before it reaches the ground

Explanation:

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.