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Speed of the block when it is from its equilibrium position

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A 10 Kg block on a horizontal frictionless surface is attached to a light spring (force constant = 80 kN/m). The block is initially at rest at its equillibrium position when a force (magnitude P=80N) acting paralel to the surface is applied to the block (stretching the spring). What is the speed of the block when it is 13 cm from its equillibrium position?

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The expert examines the speed of a block when it is from its equilibrium position.

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