Answer:Impossible to answer without knowing their actual initial speeds
Explanation:
Given
Ball A launched at angle of [tex]20^{\circ}[/tex]
Ball B is launched at angle of [tex]75^{\circ}[/tex]
At the highest  point Ball vertical velocity will be and there will be only horizontal velocity i.e. [tex]v_acos20[/tex] and [tex]v_bcos75[/tex]
where [tex]v_a and v_b[/tex] is the velocity of A & B
thus to find which one is greater we need to know their initial velocity.
It is impossible to know which one have higher velocity at highest point.
