Two people walking on a sidewalk have the following equations of motion:
xi = 8.2 m + (-1.1 m/s)t
x2 = 5.9 m + (1.7 m/s)t
(a) Which person is moving faster? (b) Which
person
will be at x = 0 at some time in the future?

X2 is fasteer

x=0 will go to Xi

Explanation:

number of electrons for neutral cl

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.