A kid throws a skittle strait up in the air. It takes 4.2 seconds to reach its max height and fall back to the height it was thrown from. What was the initial velocity the skittle was thrown at?

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th