Free-fall kinematics on a plane: Displacement from Window to Ground?

[Veras]

Homework Statement

A ball is thrown vertically upward from a window at 10m/s. It hits the ground 5.0 seconds later. What is the height of the window from the ground?

Given
Vi = 10 m/s
Vf = 0
Δt = 5.0 m/s
$$Δa = -9.8 m/s^2$$

Find
Δd(w-g) = ?

Homework Equations

Δd = Vi(Δt) + $Δa(Δt)^2$

And the other four "kinematic equations"

The Attempt at a Solution

Total displacement:

$$Δd = ((vi + vf)/2)(Δt)$$

= (10/2)(5)
= 25 m
Not sure where to go from here and if I'm on the right track. Your help is greatly appreciated!

P.S. I apologize for the terrible formatting. I'll get it soon enough!

 

[Veras]

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