You wad up a piece of paper and throw it into the wastebasket. how far will
your piece of paper travel if you throw it with a velocity of 4.3 m/s at an angle
of 65°? (assume no air resistance and that the paper lands at the same
height you threw it from.)
a. 0.65 m
b. 1.2 m
c. 1.4 m
d. 0.17 m

dang that balls went far

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.

elctricity and magnet is conversion to it