A cannon must shoot a shell and hit a target on a mountain. The target is located a distance d to the east of the cannon and is elevated at a height h above the cannon. The cannon is set to fire the shell at an angle of 45° above horizontal. Derive a formula for the initial speed v0 of the shell that is required to hit the target. Write your answer as a function of d, h, and g.
1) 13
2) 12.5
3) 14
4) 15