Velocity vs Time What is the acceleration of the car at segment C?
O 30 m/s2
0 -30 m/s2
O 40 m/s2
0-40 m/s2
50
40
В
E
30
Velocity (m/s)
N
20
A
10
D
0
0 1 2 3 4 5 6 7 8 9 10
Time (s)

compass can be used day and night, cloudy or sunny

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.