# if a 750 kg racecar slowed from 32 m/s to 15 m/s, what was the change in momentum?

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Expert Answers

gsenviro | Certified Educator

Momentum of a body is the product of its mass and velocity. In this case, the mass of the racecar is 750 kg and its initial and final velocities are 32 m/s and 15 m/s, respectively.

Hence, initial momentum = 750 kg x 32 m/s = 24,000 kg m/s

Final momentum = 750 kg x 15 m/s = 11,250 kg m/s

Change in momentum = Final momentum-initial momentum

= 11250-24000 kg m/s = **-12,750 kg m/s**

The negative sign indicates a reduction in momentum of the car.

Hope this helps.