John is pulling a sled to haul up a snowy hill to this cabin. The slope is 220 from the horizontal, the sled has a mass of 16.0 kg, the coefficient of kinetic friction between the sled runners and the snow is 0.130, and John can exert a force of 1400 N parallel to the surface of the hill. What is the largest load of wood (in kg) that John can take in one trip?​

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.