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A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m ) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. How much work is done on the mass between A and B by the force of friction? −8.9 J −7.3 J −8.1 J −6.6 J −24 J

A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m ) as shown. The speed of the mass at point A is 3.2 m/s, and at point B, it is 6.0 m/s. How much work is done on the mass between A and B by the force of friction? −8.9 J −7.3 J −8.1 J −6.6 J −24 J

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A 1.2-kg mass is projected down a rough circular track (radius = 2.0 m ) as shown. The speed of the mass at point A is 3.2 m / s , and at point B , it is 6.0 m / s . How much work is done on the mass between A and B by the force of friction? − 8.9 J − 7.3 J − 8.1 J − 6.6 J − 24 J

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