Suppose that C is the top-half of the circle (x - a)² + y² = a², (a > 0) oriented in the counterclockwise direction. Let F be a force field that has constant magnitude c and always directed from (x, y) toward the origin. The work done by the force F on a particle that moves along C is Jo F.Tds 2ac. Explain how do we obtain this formula. =

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