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A squid keeps some amount of water in a body cavity, ready to expel it in case of danger. Suppose the mass of the water in the cavity is 2kg

A squid keeps some amount of water in a body cavity, ready to expel it in case of danger. Suppose the mass of the water in the cavity is 2kg and the mass of the squid (without the water) is 6kg. If the squid suddenly expels that water at a speed of 9 m/s in some direction, with what speed does the squid recoil in the opposite direction?