What are the equivalent numbers?

Which representation has a constant of variation of -2.5

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)

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?