1)To represent a cart with the hand acting upon it, the bob in motion, the bob at rest, and the cart in motion
2) The solutions turned out to be the same.
3) The arrow's length changes because of what is stated in Newton's Third Law.
4)We are able to know the force is not zero when it is moving because there is a force of string on the cart.
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Short but good! Grade = 4 / 4
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