A cat walks along a plank length 400 m and mass 700 kg, Ask an Expert

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A cat walks along a plank (length = 4.00 m and mass = 7.00 kg). The plank is supported by 2 sawhorses (one .44m from the left and 1.5 m from the right end). When the cat reaches the right end, the plank just begins to tip. What is the mass of the cat?

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