To find the angle \(\theta\) that the string makes with the ground, we can use the properties of a right triangle.
In this scenario, we have:
- The height of the kite (the vertical side of the triangle) = 50 meters
- The length of the string (the hypotenuse of the triangle) = 70 meters
Using the sine function, we can express the relationship as follows:
\[ \sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}} = \frac{50}{70} \]
Calculating \(\frac{50}{70}\):
\[ \sin(\theta) = \frac{50}{70} = \frac{5}{7} \approx 0.7143 \]
Now, we take the inverse sine (arcsine) to find \(\theta\):
\[ \theta = \arcsin\left(\frac{5}{7}\right) \]
Using a calculator to find the angle:
\[ \theta \approx 45.57^\circ \]
Thus, the angle that the string makes with the ground is approximately:
\[ \boxed{45.57^\circ} \]