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The question asks which object has the most **kinetic energy**. Kinetic energy is given by the formula:

\[
KE = \frac{1}{2}mv^2
\]

where:
- \(m\) is the mass of the object,
- \(v\) is the velocity of the object.

Now, let's analyze each option:
- **A. A 25 kg fish tank sitting on a table:** Since the fish tank is stationary, its velocity is zero, and thus its kinetic energy is zero.
- **B. A 50 g fish swimming in a fish tank:** While the fish is moving, its mass is quite small (0.05 kg). The kinetic energy would depend on its velocity, but typically, the swimming speed of a fish is relatively low, so the kinetic energy will be small.
- **C. A 7,500 kg car parked on a steep hill:** The car is parked and stationary, so its velocity is zero. Thus, its kinetic energy is also zero.
- **D. A 50 kg boulder suspended from a cliff:** Since the boulder is suspended and not moving, its velocity is zero, resulting in zero kinetic energy.

Among the options, **B** is the only one involving an object in motion, meaning it has some kinetic energy, albeit a small amount. Therefore, **the 50 g fish swimming in a fish tank** (option B) has the most kinetic energy.

Would you like further details or have any questions? 

Here are some related questions to deepen your understanding:
1. How does kinetic energy depend on both mass and velocity?
2. Can an object have potential energy if it is stationary?
3. What is the difference between kinetic and potential energy?
4. How is the kinetic energy affected by increasing the speed of an object?
5. Why is the kinetic energy of a parked object zero, even if it's on a steep hill?

**Tip:** Always check whether an object is in motion to determine if it has kinetic energy. Stationary objects have zero kinetic energy.

Which of these has the most kinetic energy? A. A 25 kg fish tank sitting on a table. B. A 50 g fish swimming in a fish tank. C. A 7,500 kg car parked on a steep hill. D. A 50 kg boulder suspended from a cliff.

Analyze which object from a list has the most kinetic energy, using the formula KE = (1/2)mv^2. Explore the kinetic energy of different objects, such as a stationary fish tank, a swimming fish, a parked car, and a suspended boulder. Suitable for Grades 7-9.

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