With what velocity does it hit the ground?

That depends on a number of things that we don't know because you haven't told us.

If any of the things on this list changes, then the answer to the question changes:

-- What is "it" ?

-- Was it dropped, thrown, fired, or launched ?

-- From what height above the ground ?

-- With what speed ?

-- In what direction ?

-- What is the acceleration of gravity where this took place ?

-- Did any drag act on it, due to liquid or gas, before it hit the ground ?

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.