Weathering by water would cut its top deeper than the middle
        
             
        
        
        
They need more oxygen to function, so gas exchange needs to increase
        
                    
             
        
        
        
As stated in the statement, we will apply energy conservation to solve this problem.
From this concept we know that the kinetic energy gained is equivalent to the potential energy lost and vice versa. Mathematically said equilibrium can be expressed as


Where,
m = mass
 = initial and final velocity
 = initial and final velocity
g = Gravity
h = height 
As the mass is tHe same and the final height is zero we have that the expression is now:





