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4. a 20-kg child is tossed up into the air by her parent. the child is 2 meters off the ground traveling 5 m/s.

circle one: ke / gpe / both

show your work for finding the values of each type of energy the object has

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.