1. Look at the figure below. Which explanation best summarizes the hypothesis shown in the figure?
A. The continents were once a single landmass named Pangaea.
B. The continents were once a large landmass named Pangaea, which began to break
apart and drift toward the present-day locations of the continents.
C. The continents were once a large landmass, but the north and south magnetic poles
pulled the continents apart toward the poles.
D. The continents were once a large landmass, but the ocean levels rose, and these
oceans separate today's continents.

momentum of soft ball three times less than baskey ball

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.