Squids and octopuses propel themselves by expelling water. They do this by keeping water in a cavity and then suddenly contracting the cavity to force out the water through an opening. A 7.50 kg squid (including the water in the cavity) at rest suddenly sees a dangerous predator.
If the squid has 1.75 kg of water in its cavity, at what speed must it expel this water to instantaneously achieve a speed of 2.60 m/s to escape the predator? Neglect any drag effects of the surrounding water.
How much kinetic energy does the squid create by this maneuver?
Use momentum conservation principle to find the speed of the water and use the speed of water and squid to find the total kinetic energy created.
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