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If two objects are traveling toward one another at an equal speed (say, 17 mph), what is the equivalent force upon impact of an object (let's assume same weight if that matters) colliding with a stationary object?

Specifically two objects of the same weight colliding at 17 mph = one object colliding with a stationary object at X mph.

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# Two objects traveling at speed x is equal to one object hitting stationary object at?

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