A 2.8 kg air mattress is 2 m long, .5 m wide, & .1 m thick. What mass can it support in water before sinking?

Answer 1

It can support a mass M such that
M + m = volume x (water density)
where m is the mass of the mattress and Volume = 0.1 m^3. The water density is 1000 kg/m^2.

Solve for M

Answer 2

10000