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A bullet of mass 5.9 g is fired horizontally into a 3.8 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.37. The bullet stops in the block, which slides straight ahead for 1.7 m (without rotation). (a) What is the speed of the block immediately after the bullet stops relative to it? (b) At what speed is the bullet fired?

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