Stan argues that momentum cannot be conserved when a collision is not a head-on collision. Rachel insists it is conserved because each body receives an impulse of equal magnitude. Rachel is correct because
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each body exerts an equal and opposite force on the other during the collision.
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the forces act during equal time intervals.
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the law of conservation of momentum for an isolated system is a vector equation.
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of all of the above.
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of only (a) and (b) above.