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Solution 17.4b

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Revision as of 18:53, 10 March 2011 by Ian (Talk | contribs)
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As the brick has no speed at the start

KE = KE gained.

Using Energy lost due to friction = Work done against friction we get,

PE lost - KE gained = Work done against frictionwhich givesKE = KE gained = PE lost - Work done against friction

KE=29.83.2103.2=30.72 J212v2=30.72v=5.54 ms-1