A child with a mass of 65.0 kg stands on a board with a mass of 225 kg. The initially stationary board surface can slide freely over the frozen lake surface, which is flat and frictionless. If the child moves on the board with a constant speed of 2.5 m / s relative to the board, what speed does it move relative to the frozen lake surface? A) 1.58 m / s B) 1.15 m / s C) 1.94 m / s D) 1.76 m / s E) 2.25 m / s

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