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If two carts of equal masses going -1m/s and 1m/s respectively collide with each other instantaneously,...

If two carts of equal masses going -1m/s and 1m/s respectively collide with each other instantaneously, what is the change in momentum (impulse) for each of the carts?

In an example like this, what would I use for delta(t) in the impulse equation? If the collision is instantaneous, how am I supposed to know how long a force was applied for?

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