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A submerged submarine alters its buoyancy so that it initially accelerates upward at 0.325 m/s^2. What is the submarine's average density at this time? (Hint: the density of sea water is 1.025*10^3 kg/m^3).

The difference of densities will give you the net bouyant force on the sub per m^3. Assume a volume V for the sub.

Mass sub= V*density sub
Bouyant force= bouyantforce/m^3 * V


This ignores the friction of the water, which is considerable in real life.

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