Which statement best describes models A and B above? (DOK 2) Question 2 options: Model A is an animal cell and model B is a plant cell because model B contains chloroplasts and a cell wall, all of which model A does not have. Model A is an animal cell and model B is a plant cell because model A contains a nucleus in the center of the cell and model B contains a nucleus near the edge. Models A and B are both plant cells because they both contain a nucleus, mitochondria. Models A and B are both animal cells because they both contain a nucleus and mitochondria.

the dissolution of polymer can be thermodynamically described in 2 steps.

a is the correct answer

(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