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## Homework Statement

A ball thrown horizontally at 12.4m/s from the roof of a building lands 20.2m from the base of the building. How tall is the building?

## Homework Equations

I think I'm supposed to use these:

horizontal motion: x=x0+vx0t

vertical motion: y=y0=+vy0(t)-.5at^2

## The Attempt at a Solution

So this is what I think goes where:

x=20.2

x0= 0

y0= 0

vy0=12.4

a= -9.8

I plugged them in but I'm not sure if they're even in the right spot. After I plug them in I have no idea where to go from there. Please help.