What’s the answer 9 = v /5 answer i need

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

With finding limits of multi variable !