Question

practice it!
select the statement(s) that accurately describe the energy transformation that occurs when playing tennis.
the tennis racket has potential energy when it is swinging through the air and has kinetic energy when it is resting on a bench.
the tennis ball hits the ground it has potential energy and when it bounces back up it has kinetic energy.
the ball has potential energy before it is served. when the ball is hit by the racket, it now has kinetic energy.
when the tennis ball is at its highest point in the air, it has gravitational potential energy, and it also has kinetic energy because it is moving.
the ball has kinetic energy as it moves through the air. it has potential energy when it comes to rest against a fence.

Explanation:

1. Analyze the first statement: A swinging racket is in motion, so it should have kinetic energy, and a resting racket (on a bench) has potential energy (due to its position, though minimal). So this statement is incorrect.
2. Analyze the second statement: When the tennis ball hits the ground, it is in contact and momentarily at rest (or has very low kinetic energy), and its energy is more like elastic potential energy (if we consider deformation) or gravitational potential energy is low. When it bounces back up, it gains kinetic energy. But the description of "potential energy when hitting the ground" is a bit simplistic but among the options, the other incorrect one is the first. However, let's check others.
3. Third statement: Before serving, the ball is at rest (relative to the server's hand, but has gravitational potential energy due to height) and when hit, it gains kinetic energy. This is correct.
4. Fourth statement: At the highest point in the air, the ball has maximum gravitational potential energy and still has horizontal (or some) kinetic energy (since it's moving forward), so this is correct.
5. Fifth statement: When moving through the air, it has kinetic energy, and when at rest against a fence, it has potential energy (due to its position), so this is correct.

The incorrect statement is: "The tennis racket has potential energy when it is swinging through the air and has kinetic energy when it is resting on a bench." The correct statements are the other four (the ones with checkmarks, except the first one which is incorrect). Wait, the original has some checkmarks, but let's re - evaluate:

• The first statement is wrong (swinging racket: kinetic; resting: potential).
• Second statement: When hitting the ground, the ball's energy: when it hits the ground, it's deforming, so elastic potential energy, and when bouncing back, kinetic. So the statement says "potential energy when hits the ground" (which can be considered as elastic potential) and "kinetic when bounces back" – this is acceptable.
• Third statement: Before serving, the ball is at rest (has potential energy, e.g., gravitational if held up) and when hit, kinetic – correct.
• Fourth statement: At highest point, gravitational potential energy is high, and since it's moving (projectile motion, horizontal velocity), it has kinetic energy – correct.
• Fifth statement: Moving through air: kinetic; at rest against fence: potential (due to position) – correct.

So the incorrect statement is the first one, and the correct ones are the last four (the ones with checkmarks except the first non - checked? Wait, the original image has some checkmarks. Let's list the correct statements:

1. "The tennis ball hits the ground it has potential energy and when it bounces back up it has kinetic energy." (Correct, considering elastic potential at impact)
2. "The ball has potential energy before it is served. When the ball is hit by the racket, it now has kinetic energy." (Correct)
3. "When the tennis ball is at its highest point in the air, it has gravitational potential energy, and it also has kinetic energy because it is moving." (Correct)
4. "The ball has kinetic energy as it moves through the air. It has potential energy when it comes to rest against a fence." (Correct)

The incorrect one is "The tennis racket has potential energy when it is swinging through the air and has kinetic energy when it is resting on a bench."

Answer:

Incorrect statement: "The tennis racket has potential energy when it is swinging through the air and has kinetic energy when it is resting on a bench."

Correct statements:

• "The tennis ball hits the ground it has potential energy and when it bounces back up it has kinetic energy."
• "The ball has potential energy before it is served. When the ball is hit by the racket, it now has kinetic energy."
• "When the tennis ball is at its highest point in the air, it has gravitational potential energy, and it also has kinetic energy because it is moving."
• "The ball has kinetic energy as it moves through the air. It has potential energy when it comes to rest against a fence."