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A 25-gram block is resting on a horizontal, frictionless surface and is attached to a horizontal...

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Physics

A 25-gram block is resting on a horizontal, frictionless surfaceand is attached to a horizontal spring of k = 210 N/m. The springis stretched so that the block is 27 cm away from the spring’sequilibrium position and released from rest.

a) What is the velocity of the block when it passes through theequilibrium point?

b) At what distance from equilibrium is the spring’s potentialenergy equal to the block’s kinetic energy?

c) Suppose the block has a speed of 21 m/s when it passesthrough the equilibrium point for the first time, how much work isdone by the force of kinetic friction during that first part of theblock’s motion?

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