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7. A 5-kg box with Initial speed 4 m/s slides across the floor and comes to a stop after 0.7 s. (a)
What is the coefficient of kinetic friction? (b) How far does the box move? (c) You put a 3-kg block
in the box, so the total mass is now 8 kg, and you slide this heavier box with an initial speed of 4
m/s. How long does it take to stop?

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