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The ballistic pendulum used to be a common tool for the determination of the muzzle velocity of bullets as a measure of the performance of firearms and ammunition (nowadays, the ballistic pendulum has been replaced by the ballistic chronograph, an electronic device). The ballistic pendulum is a simple pendulum that allows one to record the maximum swing angle of the pendulum arm caused by the firing of a bullet into the pendulum bob. Let L -1.7 m and mA -5.1 kg. For a certain historical pistol, which fired a roundball of massm B -85 g, is found that the maximum swing angle of the pendulum is θ max = 56°. Determine the preimpact speed of the bullet B.

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ん 2. endudam a finad o mentum mb Vo- t, mRxo (inht.mr) 085 Vo 0:08st

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