Use g = 9.80 m / s2 and density of salt water = 1.025 x 103 kg / m3
A fish has a density slightly less than that of water and must exert a downward force to stay submerged. Calculate the magnitude of the force that an 85.0-kg fish must exert to stay submerged in salt water, if the density of its body is 1015 kg / m3.