Tell me, what are you doing?
Área, perimeter? Basically what kind of operation is it asking for?!

is equation of circle which have radius equal 5 and center in (0,0) point
Answer:
4.5 seconds pass before reaching the ground
Step-by-step explanation:
The height of the object is given by the following equation:

How many seconds pass before reaching the ground
It hits the ground when h(t) = 0. So






There are no negative instants of time, so only the positive answer interests to us.
4.5 seconds pass before reaching the ground