When two objects collide in a plane surface, the incoming and outgoing velocites

Question

When two objects collide in a plane surface, the incoming and outgoing velocites are not always along the same line. Think about colliding billiard balls. The balls scatters to the side. Such collisions are two dimensional collisions. Choose from the list below, the appriate steps on solving problems in two-dimensional collisions:

Choosing a perpendicual cordinate system.

Resolving the motion into components along the choosen coordinates.

Obtaining a pair of one dimensional problems

Solving pair of equations simultaneously.

Explanation / Answer

all of the above steps

Choosing a perpendicual cordinate system.

Resolving the motion into components along the choosen coordinates.

Obtaining a pair of one dimensional problems

Solving pair of equations simultaneously.

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