An elevator is moving up at a constant velocity of 2.50 m/s, as illustrated in the diagram below:The man has a mass of 85.0 kg.
How large is the force that the floor exerts on the man?

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.