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A large fake cookie sliding on a horizontal surface is attached to one end of a horizontal spring with spring constant `k=360` N/m, the other end of the spring is fixed in place. The cookie has a kinetic energy of 20.0 J as it passes through the spring's equilibrium position. As the cookie slides, a frictional force of magnitude 10.0 N acts on it . (a) How far will the cookie slide from the equilibrium position before coming momentarily to rest ? (c) What will be the kinetic energy of the cookie as it slides back through the equilibrium position ?

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The correct Answer is:
(a) 0.307 m ; (b) 13.9 J
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