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Q. A 135 kg cannon at rest contains a 9.5 kg cannon ball. While fired, the cannon ball leaves the cannon with a speed of 115m/s. What is the recoil speed of cannon?

Q. A 16.5 kg gold bar at 27 °C is placed in a large, insulated 0.800 kg glass container at 15°C with 2.00 kg of water at 25.0°C. Compute the final equilibrium temperature.

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