Question

a car with a momentum of 30 kg m/s crashes into a car at rest. after the collision, the 1st car has a momentum of 10 kg m/s and the 2nd car has a momentum of 20 kg m/s. this can be explained by

newtons 1st law

newtons 2nd law

newtons 3rd law

law of conservation of momentum

Explanation:

The total initial momentum is 30 kg m/s (as one car is at rest with zero momentum). After the collision, the sum of the momenta of the two - cars is 10 kg m/s + 20 kg m/s=30 kg m/s. The law of conservation of momentum states that the total momentum of a closed system remains constant. Here, the system of two cars has its total momentum conserved before and after the collision. Newton's 1st law is about inertia, 2nd law is about force - mass - acceleration relationship, and 3rd law is about action - reaction pairs.

Answer:

Law of conservation of momentum