a space probe is traveling in outer space with a momentum that has a magnitude of 7.5 × 107 kg · m/s. a retrorocket is fired to slow down the probe. it applies a force to the probe that has a magnitude of 2.0 × 106 n and a direction opposite to the probe's motion. it fires for a period of 12 s. determine the momentum of the probe after the retrorocket ceases to fire.
