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**1. Homework Statement**

A 0.21 kg rock is projected from the edge of

the top of a building with an initial velocity of

7.82 m/s at an angle 56 above the horizontal.

Due to gravity, the rock strikes the ground at

a horizontal distance of 10.5 m from the base

of the building.

How tall is the building? Assume the

ground is level and that the side of the build-

ing is vertical. The acceleration of gravity is

9.8 m/s2 .

Answer in units of m.

**2. Homework Equations**

Kinematics equations. Pythagorean Theorem:

^{A}+

^{B}=

^{C}

**3. The Attempt at a Solution**

i tried to think about what I needed, and what equation would help me find it. In this case, the height h, I chose the following equation:

H =

^{Vy}-

^{VoY}/ 2A from the initial kinematics equation of

^{Vy}=

^{Voy}+ 2AH

From here, however, I am unsure how to determine Vy, which is the only variable I would need.