The dog sled will experience positive acceleration if:
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they add bags to the sled.
they add a dog to the sled.
they add a person to the sled.
all of the above
All of the above
The correct answer is "they add a person to the sled."
To determine which scenario would result in positive acceleration for the dog sled, we need to understand the concept of acceleration. Acceleration is the rate at which an object changes its velocity over time. Velocity is a vector quantity that includes both speed and direction.
In this case, positive acceleration means that the sled's velocity is increasing in a positive direction.
Now let's consider each scenario:
1. If they add bags to the sled: Adding bags to the sled increases its mass. Since force is equal to mass times acceleration (F = m x a), an increase in mass results in a decrease in acceleration for a given force. Therefore, adding bags would not result in positive acceleration.
2. If they add a dog to the sled: Adding a dog would also increase the sled's mass, similar to adding bags. Therefore, adding a dog would not result in positive acceleration.
3. If they add a person to the sled: Adding a person to the sled also increases its mass. Again, this would result in a decrease in acceleration for a given force. Therefore, adding a person would not result in positive acceleration.
Based on the analysis of each scenario, none of them would result in positive acceleration for the dog sled.
So the correct answer is: None of the above.