+2511 The solution for the equation may be correct, but…not correct-o-mundo.
This equation is inconsistent with the question.
Initially, the equation describes a ball thrown downward at 8 feet per second, from a height 33 feet below ground level, in a negative gravity environment with an upward acceleration of -0.06216G –this corresponds to an acceleration of just under -2fts-2.
After the ball slows to a stop, and rises, the velocity curve implies the gravity changes to -0.03108G –this corresponds to an acceleration of
just under -1fts-2
If the ball bounces in a perfectly elastic collision and rises at an initial velocity of 8 feet per second, then slowing to 7 feet per second as passes ground level, implies the acceleration from gravity is now positive @ 0.00444G (This implies gravity changed from negative to positive.)
Note that negative gravity implies negative mass. https://en.wikipedia.org/wiki/Negative_mass
One possible environment where this could occur in the real world is in a liquid environment where the ball is positively buoyant. The change in pressure as the ball changes in relative depth would change its acceleration.
This is an entertaining thought experiment, but it’s not easy to think this way. 
GA
+2511 The color patterns you are seeing are known as moiré fringes. The image posted here is not a screen-shot; it was created using a digital camera to photograph a computer screen.
Moiré fringes occur when the photo sensor (a dot matrix array) focuses without alignment on a computer screen (another dot matrix array), any misalignment in the matrixes will cause interference patterns. A similar moiré effect (with less color) is noted in photos of near-focus objects imaged through a (window) screen.
The moiré fringe artifacts disappear at zero degrees (alignment) and at multiples of 30-degree angle rotations. This is easily observed by rotating the digital camera while viewing the image in the video monitor.
GA
