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A 40-g object connected to a spring with a force constant of 30 N/m oscillates with an amplitude of 8 cm on a frictionless, horizontal surface.

(a) Find the total energy of the system.

(b) Find the speed of the object when its position is 1.25 cm. (Let 0 cm be the position of equilibrium.)

(d) Find the potential energy when its position is 2.5 cm.

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