Is bubble chamber one of your choices? Bubble chamber sounds like a good fit for the question.
Answer:
Left and right: two forces
Total: four forces
Explanation:
If it's just the forces that they are using it would be two the force of each person's hand on the other. However there is also gravity pulling down on their hand but they use another force to pull it up which you can call the normal force.
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Answer:
I am not really sure, but I think Fr.
Explanation:
