A mass m1= 3kg slides down slippery ramp, reaching a speed v=9 m/s at the bottom.After reaching the level ground m1 collides with mass m2= 4kg at bottom, sticking together in a perfectly inelastic collision. The combined mass then slides over a floor, finally coming to rest after travelling a horizontal distance x= 6m. a.) What is the force of friction between the combined masses and the floor? b.) What is the coefficient of kinetic friction between the floor and masses?

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