A rigid (solid) cylinder is put at the top of a frictionless $25^\circ$-to-the-horizontal incline that is $3.0 \, \text{m}$ high. It is then released so that it rolls down the incline. If $v$ is the speed at the bottom of the incline, what is $v^2$, in $\text{m}^2/\text{s}^2$? 

[i](B. Dejean and Ahaan Rungta, 3 points)[/i]
[b]Note[/b]: Since there is no friction, the cylinder cannot roll, and thus the problem is flawed. Two answers were accepted and given full credit.
1. **Understanding the problem**: The problem states that a rigid cylinder is placed on a frictionless incline and released from rest. Since the incline is frictionless, the cylinder will slide down without rolling. We need to find the speed squared, \(v^2\), at the bottom of the incline.

2. **Energy conservation approach**: Since there is no friction, we can use the conservation of mechanical energy to solve this problem. The potential energy at the top will convert entirely into kinetic energy at the bottom.

3. **Potential energy at the top**: The potential energy (\(PE\)) at the top of the incline is given by:
   \[
   PE = mgh
   \]
   where \(m\) is the mass of the cylinder, \(g\) is the acceleration due to gravity, and \(h\) is the height of the incline. Given \(h = 3.0 \, \text{m}\), we have:
   \[
   PE = mg \cdot 3.0 \, \text{m}
   \]

4. **Kinetic energy at the bottom**: At the bottom of the incline, all the potential energy will have converted into kinetic energy (\(KE\)). The kinetic energy is given by:
   \[
   KE = \frac{1}{2}mv^2
   \]

5. **Equating potential energy and kinetic energy**: By conservation of energy, we have:
   \[
   mgh = \frac{1}{2}mv^2
   \]
   Substituting \(h = 3.0 \, \text{m}\), we get:
   \[
   mg \cdot 3.0 = \frac{1}{2}mv^2
   \]

6. **Solving for \(v^2\)**: Canceling \(m\) from both sides and solving for \(v^2\), we get:
   \[
   g \cdot 3.0 = \frac{1}{2}v^2
   \]
   \[
   2g \cdot 3.0 = v^2
   \]
   \[
   6g = v^2
   \]

7. **Substituting \(g = 9.8 \, \text{m/s}^2\)**: Finally, substituting the value of \(g\), we get:
   \[
   v^2 = 6 \cdot 9.8
   \]
   \[
   v^2 = 58.8 \, \text{m}^2/\text{s}^2
   \]

The final answer is \(\boxed{58.8 \, \text{m}^2/\text{s}^2}\).