4. a 1200 kg car traveling north at 20.0 m/s collides with a 1400 kg car traveling south at 22.0 m/s. the two
cars collide and entangle. what is the resulting velocity of the wreckage?

-2.61 m/s

Explanation:

This problem can be solved by the Conservation of Momentum principle, which establishes that the initial momentum must be equal to the final momentum :

(1)

Where:

(2)

(3)

is the mass of the first car

is the velocity of the first car, to the North

is the mass of the second car

is the mass of the second car, to the South

is the final velocity of both cars after the collision

(4)

Isolating :

(5)

(6)

Finally:

(7) This is the resulting velocity of the wreckage, to the south

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