The optimal angle at the ball should be struck to keep it in the air for the longest is 90 degrees
Angles of incidence and reflection are equal when waves strike a boundary and are reflected. The angle of incidence is the angle formed by a line drawn perpendicular to the reflecting barrier and the wave's direction of motion.
The angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence is known as the angle of incidence (called as normal).
The angle of incidence is the angle formed by the incident beam and the normal. The angle of reflection is the angle formed by the reflected beam and the normal. i.e:∠i=∠r.
Longer time will be the outcome of a higher trajectory. Therefore, a 90-degree angle takes longer to complete than other angles.
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