The chart shows the speed at which light travels through different media. A 2 column by 5 row table. Column 1 is titled Medium and contains the following entries: Water, Air, Glass, Diamond. Column 2 is titled Speed of Light (meters per second) and contains the following entries: 2.25 times 10 Superscript 8 baseline, 2.99 times 10 Superscript 8 baseline, 1.97 times 10 Superscript 8 baseline, 1.24 times 10 Superscript 8 baseline.
In which medium would light have the longest wavelength?

water
air
glass
diamond

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied