What is the speed of the cannonball relative to the earth

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Q. A 470 kg cannon fires a 10 kg cannonball with a speed of 200;{rm m}/{rm s} relative to the muzzle. The cannon is on wheels that roll without friction. When the cannon fires, what is the speed of the cannonball relative to the earth?

Q. The loaded cab of an elevator has a mass of 2.8 x 10^3 kg and moves 214 m up the shaft in 23 s at constant speed. At what average rate does the force from the cable do work on the cab?

Reference no: EM1351750

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