Answer
h sqrt (19.6h)
0 0
2 6.2610
4 8.8544
5.102 10.0000
6 10.8444
8 12.5220
Any value of $h > 5.102$ will result in the velocity being greater than 10 m/s.
Work Step by Step
Please see the graph. The table was made in Microsoft Excel, and the graph was made using graphing software.