On a frictionless toy race track, a 0.035 kg 0.035 kg0, point, 035, space, start text, k, g, end text toy car moving right at 0.30 m s 0.30 s m ​ 0, point, 30, space, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction collides with another 0.040 kg 0.040 kg0, point, 040, space, start text, k, g, end text toy car moving left at 0.20 m s 0.20 s m ​ 0, point, 20, space, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. After the collision, the 0.035 kg 0.035 kg0, point, 035, space, start text, k, g, end text car moves left at 0.20 m s 0.20 s m ​ 0, point, 20, space, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction.

your answer is c! hope this : )

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i think it would be 5

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.