An aircraft weighing 21,430 N returns to the aircraft carrier and lands. It goes from 385.3 kilometers per hour (kph) to 0 kph in 2.5 seconds. What is the force required to bring the aircraft to a safe halt? (in N)? CAUTION: Think about what is happening in a physical sense and that it matches your answer.

0.19 m/s and 0.45 m/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.

i think its d if wrong im sorry