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## Homework Statement

A girl throws a ball high into the air, and at its highest point it lands on a roof, where it gets stuck. You estimate the ball landed at a height of 21.0m from the ground and a horizontal distance of about 20.0m from where it was thrown. What is the speed that the girl threw the ball at?

## Homework Equations

vfy = viy + ay(delta t)

vfy^2 = viy^2 + 2ay(delta y)

vfx = vix + ax(delta t)

x = vix (delta t) + 1/2(ax)(delta t)^2

y = viy (delta t) + 1/2 (ay) (delta t)^2

v = sqrt (vx^2) + (vy^2)

## The Attempt at a Solution

It would take an enormous amount of space to replicate my work (and this would honestly be no better than spam), but the answer I found was 22.5 m/s. Please help me.