A 2.8 kg rectangular air mattress is 2.00m long,0.500 m wide and 0.100m thick. What mass can it support in water before sinking?

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  1. Figure out its volume.

    Then, figure out the weight of the water that volume would displace

    weight displaced water= volume*density*g
    bouyance=weight water displaced-2kg*9.8N/kg

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