The impulse experienced by a car (2,000 kg) is 4,000 kg m/s. what is the change in its momentum a. 8,000 kg m/s b. 2.0 kg m/s c. 4,000 kg m/s d. 0.50 kg m/s

Just look at the units ! Two different numbers that have the same exact units can't be equal. That right there tells you that the correct choice can only be C .

It also leads you to the useful factoid that impulse and change in momentum are always exactly the same ... units and all.

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