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A 5 Kg red car traveling 10 m/s collides with a 5 Kg blue car that is stationary. If the collision is elastic, the speed of the red car after the collision will be _."
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0 m/s
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5 m/s to the left
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5 m/s to the right
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10 m/s to the left
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10 m/s to the right
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