51. rheka conducted an experiment with a radio-controlled toy car. the sketches show her findings. v, = 20 m/s d. bs time v2 = 30 m/s 2.05 time what is the average acceleration of the car? a. b. c. d. 5 m/s2 10 m/s2 15 m/s2 20 m/s2 8

chemical properties of thing

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.