From 2 King 6:1-6, one of the disciples of Elisha was cutting a tree and the ax head fell into the water. While we do not know how high the ax head was when it fell into the water, we will work through a physics example of the ax head's vertical motion as if it were dropped into the water.

1. Write the quantity and units of average gravitational acceleration on the surface of Earth.
2. Given the ax head mentioned in the opening portion with the height being equal in numerical value of the due day of this assignment.How long does it take for the ax to fall to the river surface?
3. Compute the final speed of the ax when it hits the water.