Classical Mechanics
# Momentum

Ball \(A\) of mass \(2\text{ kg}\) is rolling on a frictionless horizontal floor at \(5\text{ m/s}.\) It collides head-on with ball \(B\) of mass \(3\text{ kg}\) which is initially at rest. If we let \(v_A\) and \(v_B\) denote the respective velocities of balls \(A\) and \(B\) after the collision, in which of the following situations are the linear momenta conserved?

Define the initial direction that ball \(A\) moves in as positive direction.

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