* Viscosity: Water becomes more viscous (thicker) as it gets warmer. Viscosity is a measure of a fluid's resistance to flow. Think of honey vs. water - honey is more viscous and resists flow more.
* Friction: The greater the viscosity, the more friction an object experiences as it moves through the fluid. This is similar to how a car encounters more air resistance at higher speeds.
* Faster Travel: Since colder water has lower viscosity, it will exert less friction on the metal ball. This means the ball will encounter less resistance and be able to travel faster through the water.
Therefore, the metal ball would travel faster through water at 15°C than at 55°C.
