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An object moving on a frictionless horizontal road with a constant speed of 40 m/s...

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An object moving on a frictionless horizontal road with a constant speed of 40 m/s decreases to 15 m/s 5 s after entering a road where the friction force is constant. If the mass of the object is 4 kg, what is the friction force acting on the object, in N'? A) 10B) 15C) 20D) 25E) 30

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