some species of jellyfish use jet propulsion to get around, a much gentler form of jet propulsion than squid use. a small jellyfish takes water into its bell; the total mass of jellyfish and water is 3.2 g. the jellyfish then rapidly ejects 1.3 g of water, achieving a speed of 0.070 m/s.

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.