Answer:
<h2>After two seconds, the ball reached 9 units up.</h2>
Step-by-step explanation:
The given function is

The given function models the path of the ball.
The maxium height the ball reached is given by the vertex of this function, which has coordinates  , where
, where  and
 and  .
.
From the equation, we know that  ,
,  and
 and  . Replacing these values, we have
. Replacing these values, we have


Where  determines the height and
 determines the height and  the time when the maximum height was reached by the ball.
 the time when the maximum height was reached by the ball.
The maximum height is 9 units.
Therefore, after two seconds, the ball reached 9 units up.