-
That's 100 over 20,
-
which is 5 meters.
-
So y=y0+5 meters,
-
and that was the height to which it rises.
-
I think we got it somewhere else.
-
We found the maximum height to be 20 meters.
-
Another thing you can do is you can find the speed here.
-
If you want to find the speed there,
-
you put the equation v^(2)=v0^(2)-2g.
-
What is y-y0? The final y is 0,
-
the initial y is 15. You solve for that
-
equation and you will find the final velocity.