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A net force acts on a box and it moves as shown in the velocity-time graph below.

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Which of the following statements is true about the direction of the net force that acts on the box based on the graph?


The net force is zero because the graph is a straight line.


The net force is directed toward the North, however, multiple forces may be acting on the box but the vector sum is positive and to the North.


The net force is directed toward the South with equal and opposite forces acting East and West.


The net force is directed upward and increases as time goes on. There may be an increasing upward force applied or a decreasing downward force added to a constant upward force.

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