a firework is fired from the ground straight up on a planet with an acceleration dye to gravity of 13.80m/s/s. The fire work will not explode until the moment where it would have started to move back down again. The initial speed of the fire work is 112.1m/s use this information to find the height at which the fire work explodes and the time it will be traveling upward​

where is the photo and the answer choices?

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.

friction

explanation:

they us to move forward and backwards