What minimum speed is required for the ball to clear the 0.90-m-high net about 15.0 m from the server if the ball is "launched" from a height of h = 2.80 m ?

First, let us assign the variables

y = 0.90 m, x= 15 m,   = 2.80 m

s= required

The vertical component of the trajectory is in uniformly accelerated motion. The equation is:

, while the horizontal component is . Also,  since the object starts from rest (with respect to the downward motion). a is negative because it is moving downwards (a = -9.81 m/s^2). Substituting,






 
The magnitude of v0, which is speed (s), is equal to 24.1 m/s

So what is the question