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A block of mass m = 2.00 kg is attached to a spring of force constant k = 5.15 102 N/m that lies on a horizontal frictionless surface as shown in the figure below. The block is pulled to a position xi = 5.75 cm to the right of equilibrium and released from rest.

(a) Find the the work required to stretch the spring.
______ J

(b) Find the speed the block has as it passes through equilibrium.
_______ m/s

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