Consider a horizontal floor without friction. Then a person of weight 900N pushes horizontally with a force of 200 N on a crate weighing 1800 N. Which statement could be true as a result of this push? a. The crate will not move because the push is less than its weight.
b. The person will accelerate at 1.08 m/s^2 and the crate will accelerate at 2.17 m/s^2, but in opposite directions.
c. The person and crate will both have an acceleration of 1.08 m/s^2, but in opposite directions.
d. The person and crate will both have an acceleration of 2.17 m/s^2, but in opposite directions.
e. The person will accelerate at 2.17 m/s2 and the crate will accelerate at 1.08 m/s^2, but in opposite directions.

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.

moisture is lackin, and organic acids are scarce.