What is the momentum of a 100-kg football player running north at a speed of 4m/s

Momentum, p = 400 kg-m/s

Explanation:

Given that,

Mass of the football player, m = 100 kg

Velocity of the player, v = 4 m/s (towards north)

Let p is the momentum of the player. It is given by the product of mass and velocity of the object. Mathematically, it is given by :

p = m v

p = 400 kg-m/s

So, the momentum of the player is 400 kg-m/s. Hence, this is the required solution.

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.

this would be about 43%