Jared is making a yummy Thanksgiving dinner when tragedy strikes: he drops a 600 gram bowl! Immediately upon impact, the bowl shatters into 3 pieces, which travel horizontally along the floor. A 185-gram piece travels at 1.95 m/s along the +x axis. A 240-gram piece has a speed of 1.45 m/s along the +y axis. Using conservation of momentum, find the magnitude of the total speed of the 3rd piece?

i don't understand. explain it clearly

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.