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Q. A 80g particle is moving to the left at 25 m/s. How much work must be done on the particle to cause it to move to the right at 37 m/s?

Q. An Atwood machine consists of two masses, = 6.5=8 and = 8.4 , connected by a cord that passes over a pulley free to rotate about a fixed axis. The pulley is a solid cylinder of radius = 0.40 and mass 0.80 .

What percentage of error in would be made if the moment of inertia of the pulley were ignored? Ignore friction in the pulley bearings.

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