NEED HELP ASAP (WORK PROVIDED) A ball is fired straight horizontally from a 20 meter high cliff. It lands 30 meters from the base of the cliff.

Find the initial speed of the ball.

Find the speed( total speed) of the ball after 1.2 seconds.

1 the 4 is sig

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

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.