Problem: A small rock is thrown straight up from the edge of the roof of a building with an initial speed of v0. The rock reaches the ground 3.00 s after being thrown and has speed 20.0 m/s just before it strikes the ground. Neglect air resistance. What is the height of the building?

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A small rock is thrown straight up from the edge of the roof of a building with an initial speed of v0. The rock reaches the ground 3.00 s after being thrown and has speed 20.0 m/s just before it strikes the ground. Neglect air resistance. 

What is the height of the building?