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Pulling a Cart

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Here's the actual problem:

Suppose that you have a cart with very little friction, and you pull this cart with a constant force.

A) After the cart is moving, is the force that is applied to the cart by the string constant, increasing, or decreasing? Explain.

B) How does the acceleration graph vary in time? Does a constant applied force produce a constant acceleration? Explain.

C) How does the velocity graph vary in time? What kind of change in velocity corresponds to a constant applied force? Explain.

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