This form of locomotion is speedy, but is it efficient? The energy that the squid expends goes two places: the kinetic energy of the squid and the kinetic energy of the water. Think about how to define "what you get" and "what you had to pay"; then calculate an efficiency for this particular form of locomotion. (You can ignore biomechanical efficiency for this problem.)

Squid usually move by using their fins, but they can utilize a form of "jet propulsion," ejecting water at high speed to rocket them backward, as shown in Figure II.1. A \(4.0 \mathrm{~kg}\) squid can slowly draw in and then quickly eject \(0.30 \mathrm{~kg}\) of water. The water is ejected in \(0.10 \mathrm{~s}\) at a speed of \(10 \mathrm{~m} / \mathrm{s}\). This gives the squid a quick burst of speed to evade predators or catch prey.

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