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In a lab experiment, a 1268g glider is moving along a horizontal air track (essentially frictionless) at 1.3m/s. It encounters a rough spot 27cm long

In a lab experiment, a 1268g glider is moving along a horizontal air track (essentially frictionless) at 1.3m/s. It encounters a rough spot 27cm long and its velocity drops to 0.9m/s. What percent of the kinetic energy is lost in percent %?How much work did the friction do on the glider in J? What is the frictional force in N? What is the coefficient of kinetic friction?

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