A 2.8 kg rectangular air mattress is 2 meters long,.5 meters wide, and .1 meter thick what mass can't support 50% submerged.

Answer 1

V = 2 * 0.5 * 1 = 1 m^3.

Vs = 0.5 * 1m^3 = 0.5 m^3 = Vol. surmerged.

Mass = 0.5m^3 * 100kg/m^3 = 50 kg = mass of water displaced.

Mass = 50 - 2.8 = 47.2 kg = Mass it can
support when 50% surmerged.