To find the midpoint \( M \) of a line segment with endpoints \( U(x_1, y_1) \) and \( V(x_2, y_2) \), we use the midpoint formula:
\[ M\left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right) \]
Given the endpoints \( U(1, 2) \) and \( V(5, 0) \):
- \( x_1 = 1 \)
- \( y_1 = 2 \)
- \( x_2 = 5 \)
- \( y_2 = 0 \)
Now, we can calculate the coordinates of the midpoint:
\[ M\left( \frac{1 + 5}{2}, \frac{2 + 0}{2} \right) = M\left( \frac{6}{2}, \frac{2}{2} \right) = M(3, 1) \]
So, the coordinates of the midpoint \( M \) are:
\[ M(3, 1) \]