physics
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A tank of height H is filled with water and sits on the ground, as shown in the figure. Water squirts from a hole at a height y above the ground and has a range R. For two y values, 0 and H, R is zero. Determine the value of y for which the range will be a maximum. (Use any variable or symbol stated above as necessary.)
y =

physics 
bobpursley
first, find the velocity of the water comingout of the hole with bernoulls equation.
Then, range= velocity*timetofall
but time to fall t is found by
y=gt or t= y/g
range= velocity(y)*t/y
then take the derivative of range with respect to y. 
physics 
bobpursley
first, find the velocity of the water comingout of the hole with bernoulls equation.
Then, range= velocity*timetofall
but time to fall t is found by
y=gt or t= y/g
range= velocity(y)*g/y
then take the derivative of range with respect to y.
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