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a student uses a string to pull her 2.0 kg physics book, starting from rest, across a 2.0- m -long lab bench. the coefficient of kinetic friction between the book and the lab bench is 0.15. if the book's final speed is 4.0 m/s , what is the tension in the string? a student uses a string to pull her 4.0 kg physics book, starting from rest, across a 2.0- m -long lab bench. the coefficient of kinetic friction between the book and the lab bench is 0.15. if the book's final speed is 4.0 m/s , what is the tension in the string? a student uses a string to pull her 4.0 kg physics book, starting from rest, across a 4.0- m -long lab bench. the coefficient of kinetic friction between the book and the lab bench is 0.15. if the book's final speed is 8.0 m/s , what is the tension in the string? a student uses a string to pull her 2.0 kg physics book, starting from rest, across a 4.0- m -long lab bench. the coefficient of kinetic friction between the book and the lab bench is 0.15. if the book's final speed is 4.0 m/s , what is the tension in the string?