A 1500 kg car has 90,000 kg m/s of momentum. What is the car’s velocity?

60 m/s is the car's velocity

Explanation:

Given:

m (mass) = 1 500kg

p (momentum) = 90 000 kg m/s

Unknown:

v or Velocity

Formula and solution:

v = p/m

v = 90,000 kg m/s ÷ 1,500 kg

Final

v = 60 m/s is the car's velocity it's easy right

Why is the unit of 60 is m/s?

Because in the solution there is the same unit that is kg so we cancel it then the rest that is m/s combine it to 60 which is the quotient of 90,000 and 1,500 so the answer is 60 m/s it's very easy.

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.