The current track recorder-holder at the national Soko Box Derby championships is Sherry Lazowski, who completed the 302 meter long track in 26.585 seconds. What is her average speed for the entire course?
A 329 m/s
B 11.8 m/s
C 30.8 m/s
D 0.0880 m/s
E 11.4 m/s

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

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.

365.25 earth days are in the year of a light year