Can u list some examples of mixtures?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

Ascientific blank must be testable and capable of being proven false?

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?