Using dimensional analysis what is the relationship between v^2=u^2+2as

Identify two factors that determine the rate of stream erosion

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?