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100 lb boy stands at one edge of the skating board . The board is 6...

100 lb boy stands at one edge of the skating board . The board is 6 ft long and weighs 60 lb. Initially, the boy and the board are at rest. The boy then walks 6 ft to the opposite end with a constant speed of 3 ft/s relative to the board. Neglect friction between the board and the ground. Find the speed of the board and Displacement of the board just as the boy is about to step off.

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