5. What is the mass and weight of the bicyclist in the picture below? (Hint: W = mg)
6. If the cyclist has 2000 J of potential
energy at point C, how high is the hill?
7. All of the cyclist's kinetic energy at
point A was converted to potential
energy at point C. What is his kinetic
energy at point B, if point B is 5 meters
above the ground?
200 N

the rearrangement of particles in a physical change. hope this

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.