Afootball is thrown at an angle of 30.° above the horizontal. the magnitude of the horizontal
component of the ball’s initial velocity is 13.0 meters per second. the magnitude of the vertical
component of the ball’s initial velocity is 7.5 meters per second. [neglect friction.]

the football is caught at the same height from which it is thrown. calculate the total time the football
was in the air. [show all work, including the equation and substitution with units.]

a, c, d, e are all applying about success strategies.

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.