A light plastic cart and a heavy steel cart are pushed with forces that are equal in magnitude, starting from rest. The forces are applied for 1.0 s. after the force is removed, the momentum of the light cart is the momentum of the heavy cart.
A. greater than
B. less than
C. equal to
D. can't say- it depends on the force

I know the answer is C - equal to- but how?

a

explanation:

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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.