The speed of a block traveling on a horizontal frictional surface changes from vi = 14 m/s to vf = 12 m/s in a distance of d = 9.5 m.  How long in seconds did it take for the block to slow by this amount, assuming the acceleration is constant?   If the block has a mass of 1 kg, What is the power supplied to the block by friction?   What is the coefficient of kinetic friction between the block and surface μk?

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