A space probe is traveling in outer space with a momentum that has a magnitude of 7.75 x 10⁷ kgm/s. A retrorocket is fired to slow down the probe. It applies a force to the probe that has a magnitude of 1.78 x 10⁶ N and a direction opposite to the probe's motion. It fires for a period of 9.45 s. Determine the momentum of the probe after the retrorocket ceases to fire.

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