To graph the situation in GeoGebra, follow these steps:
1. Open GeoGebra and click on the Graphing panel.
2. Enter the equation y=-6t^2+30t+8 into the input bar and press Enter.
3. Adjust the viewing window as needed to see the graph of the water balloon's path.
4. The graph will show the trajectory of the water balloon as it falls to the ground.
To find when the balloon hits the ground, we need to find the x-intercepts of the graph, as this represents the time when the balloon is at ground level.
Using the graph, it appears that the balloon hits the ground at approximately t = 4.2 seconds.
Therefore, the balloon will hit the ground at 4.2 seconds.