And Jen the other members of the tennis team are practicing hitting tennis balls are two people identical balls at the same time which ball has the most kinetic energy

The ball that moves at the fastest velocity

Explanation:

Kinetic energy is the energy possessed by a body by virtue of its motion. It is expressed mathematically as:

KE = 1/2mv²

M is the mass

V is velocity

It can me seen from the formula that the kinetic of is directly proportional to the square of its velocity. This means that the higher the velocity of an object, the higher its kinetic energy.

If two identical balls are now hit at the same time, the ball that will have the most kinetic energy is the ball that moves at fastest velocity since they are hit at the same time.