Every little inch is thought of in swimming the goggles the head band for the swimmer to move smoothly and velocity is a big step in swimming such as races military evading pursuing it's up to the person to make sure he or she is exactly perfect and good to go that way they just focus on getting to their destination and by using velocity.
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when you are swimming, that uses kinetic energy. anything that is currently moving, it is using kinetic energy. you will also have more kinetic energy depending on your mass and speed.