How would the absence of gravity affect the formation of planets

It would be very chaotic... For example anything that was not attached to the Earth will probably go flying off into space in a straight linear line. If gravity disappeared the Earth's atmosphere would float into space so other planet's atmospheres would also flow into space. Planets will break apart into pieces and go off in space since planets are held together by gravity.

Imagine gravity is a string... Once you let go that string or quote-unquote "turn off" gravity everything will go flying into linear lines out into the vastness of the cosmos. I hope this helps if you need any more examples for have any other questions please let me know. Have a blessed day. :')

prolly a beacuse the momentuem the car has increases while going down hill

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.