Low-density polyethylene, used to make plastic films, is made by the radical polymerization of ethene, and is one of the hardest plastics to recycle. It gets its name A)

from the process by which it's polymerized.

B)

because it's strong but flexible.

C)

because of the way the chains pack like spaghetti, close and tight.

D)

from the spaces left between chains when the polymer is formed.

can you attach the

(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