What mass must be added to the train to slow it down to 15, Physics

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What mass must be added to the train to slow it down to 15

A 20 metric ton train moves toward the south at 40 m/s.

At what speed must it travel to have two times its original momentum? A metric ton is 1000 kg.

At what speed must it travel to have a momentum of 4 x 10⁵ kg · m/s?

If there were a speed limit for this train as it traveled through a city, but not a weight limit, what mass must be added to the train to slow it down to 15 m/s while at the same time keeping the momentum the same as in the second part?

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Physics: What mass must be added to the train to slow it down to 15

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