A high school experiment consists of a block of mass (2 mathrm{~kg}) sliding across a surface (coefficient

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A high school experiment consists of a block of mass \(2 \mathrm{~kg}\) sliding across a surface (coefficient of friction \(\mu=0\).6). If it is given an initial velocity of \(5 \mathrm{~m} / \mathrm{s}\), how far will it slide, and how long will it take to come to rest? The surface is now roughened a little, so with the same initial speed it travels a distance of \(2 \mathrm{~m}\). What is the new coefficient of friction, and how long does it now slide?

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