Two identical balls undergo a collision at the origin of coordinates. Before collision their scalar velocity components

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Two identical balls undergo a collision at the origin of coordinates. Before collision their scalar velocity components are (ux = 40 cm/s, uy = 0) and (ux = −30 cm/s, uy = 20 cm/s). After collision, the first ball (the one moving along the x-axis) is standing still. Find the scalar velocity components of the second ball.

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