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A jellyfish moves by filling its umbrella with water and then:
AFreezing the water solid
BHeating the water up
CPushing the water out
DAbsorbing the water in
Answer & Solution
Correct answer: C. Pushing the water out
1. Jet propulsion is momentum conservation made visible.
2. A jellyfish fills its umbrella section with water and then pushes the water out.
3. That results in motion in the opposite direction to that of the jet of water.
4. Squids propel themselves in a similar manner but can aim their nozzle forward or backward to control direction.
_Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 8 'Linear Momentum and Collisions', sections 8.1-8.7_
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