A block with mass of 5.00 kg is attached to a horizontal spring with spring constant k = 4.00 × 102 N/m. ?

The surface the block rests upon is frictionless. If the block is pulled out to xi = 0.0500 m and released, (a) find the speed of the block at the equilibrium point, (b) find the speed when x = 0.0250 m, and (c) repeat part (a) if friction acts on the block, with coefficient µk = 0.150.

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