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The speed of a cube moving on a horizontal frictional surface changes from vi = 15...

The speed of a cube moving on a horizontal frictional surface changes from vi = 15 m/s to vf = 11.5 m/s in a distance of d = 9.5 m.

a) How long in seconds did it take for the cube to slow by this amount, assuming the acceleration is constant?

b) If the cube has a mass of 1 kg, What is the power supplied to the cube by friction?

c) What is the coefficient of kinetic friction between the cube and surface μk?

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