Seat belts have been placed in cars since the 1960’s. They are a safety feature used to decrease the forces in a car crash. According to Newton’s 1st Law of Motion, identify which of the following statements explains how seat belts lessen the effects of a crash Group of answer choices

Seat belts act as an outside force to stop inertia.

Seat belts act as an outside force to stop gravity.

Seat belts act as an inside force to keep gravity in place.

Seat belts act as an inside force to keep inertia in place.

show the wavelengths of a wave. show the crests of a wave.

current flows in a wire

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.