A car travels in a straight line from A to B, a distance of 12 km, taking 552 seconds. The car starts from rest at A and accelerates for T1 s at 0.3 ms ? reaching a speed of V ms. The car then continues
to move at V ms^-1 for T2 s. It then decelerates for T3 s at 1 ms^-2, coming to rest at B.
(i) Sketch the velocity-time graph for the motion and express T1 and T3 in terms of V.
(1) Express the total distance travelled in terms of V and show that 1312V^2 - 3312V + 72000 = 0.
Hence find the value of V.

its a 5.5 n

glad that

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.