I need help now pps

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)

Find the domain of the following expression: 1/(√x)-2

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4