A 5.0-kg block moves in a straight line on a horizontal frictionless surface under the influence of a force that varies with position as show in the figure below. 10 5- -5+ (a) How much work is done by the force as the block moves from the origin to z = 8.0 m? (b) If the particle's speed passing through the origin was 4.0 m/s, with what speed does it pass the point z = 8.0 m?

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