Originally Posted by

**wafflemypanda** Hi, i have this word problem that i need to solve, however i'm not really sure how to start it...

Help would be much appreciated.

Problem:

A person standing close to the edge of a 200 foot tall builfing throws a baseball upward, such that its height above the ground in feet, s(t), after t seconds, is given by s(t)=-16t^2+64t+200

a) How long will it take for the ball to hit the ground?

set s(t) = 0 and solve for t

b) When will the ball reach its maximum height?

find the vertex of the graph of s(t) ... t = -b/(2a)

c) What is the max height the ball reaches?

evaluate s(t) for the time found in part (b)