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Calculating Unknown Mass

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Ricardo ,of mass 80 kg , and carmelita , who is lighter , are enjoing lake merced at dusk in a 30 kg canoe . When the canoe is at rest in the placid water ,they exchange seats which are 3m apart and symmetrically located with respect to canoe center . Ricardo notices that canoe moves 40cm relative to submerged log during the exchange and calculate carmelitas mass ,which she has not told him . What is it? (Piyush posted)

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