Final answer:
The calculated momentum of an object with a mass of 300g traveling at a velocity of 140 km/h is approximately 11.667 kg·m/s, which does not match any of the provided multiple-choice options.
Step-by-step explanation:
To calculate the momentum of an object, use the formula p = mv, where p represents momentum, m is mass, and v is velocity. In this case, the object has a mass of 300g (which needs to be converted to kilograms to use standard SI units, so m = 0.300 kg) and a velocity of 140 km/h (which should be converted to meters per second, so v = 140,000 m/3600 s ≈ 38.89 m/s).
Now, we can calculate the momentum: p = mv = 0.300 kg × 38.89 m/s ≈ 11.667 kg·m/s. However, this result is not matching any of the given options, indicating there may have been an error in the provided options or a miscalculation. If these are the fixed options for the momentum value, and we have to answer based on them, then none of the given answers is correct.