Arace driver has made a pit stop to refuel. after refueling, he leaves the pit area with an acceleration whose magnitude is 6.35 m/s2; after 4.0 s he enters the main speedway. at the same instant, another car on the speedway and traveling at a constant speed of 73 m/s overtakes and passes the entering car. if the entering car maintains its acceleration, how much time is required for it to catch the other car? s

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.