WAs air resistance noticeable?
Air resistance was not noticeable. As you can see in the graph, the small risen point of the line was produced because in the video the guy is just then throwing the ball into the air. After the small risen point, the line is decreasing at a constant rate as in the video the ball is reaching its equilibrium point and then lowering down to the ground. The point on the x-axis to the point highlighted is not constant because in the video that is where the ball has hit the ground and bounced up a little bit.