A train normally travels at a constant speed of 24 m/s over a long straight section of railway line. Because of track repairs taking place on a 1km stretch of the railway line, the train is restricted to travel at 6 m/s over this stretch. In order to comply with the speed limit, the train approaching at 24 m/s slows down uniformly to omst over a distance of 100 m extending up to the start of the section under repair. From the end of the 1 km restriction zone, the train accelerates to 24 m/s over a further distance of 1 km. How much time does the train lose on
the whole trip?

mistakes are ok

6 cos 34, 6 sin 34 trig

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.

0.93xc=0.93x3x10^8m/s

2.54cm is 1 inch

360seconds i 1 hr