Suppose a rubber ball collides head$-$on with a more massive steel ball traveling in the opposite direction with equal speed.

Part Aequal togreater thansmaller than

a smaller

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perpendicular

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the same

The impulse one ball receives is equal to the $$ force on it from the other ball multiplied by the time during which the force is applied. By Newton's third law the force that the rubber ball exerts on the steel ball is $$ the force the steel ball exerts on the rubber ball. So the rubber ball receives amount of impulse, although the directions of the impulses are

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