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Physics Work,Power & Energy Level: High School

Conservation of Energy

An air cart of mass m = 0.25 kg starts moving at velocity vo = 4.0 m/s on air track . After traveling a distance of 60.0 cm, the velocity of the cart drops to v = 3.8 m/s .By how much has the kinetic energy of the cart decreased ? What is the work done by friction ? What is the magnitude of the frictional force ? Calculate the coefficient of kinetic friction between the cart and the track ?