Your initial condition has the decimal point in the wrong location.
A bocce ball is accidentally dropped from a building 98m high. How long does it take for the bocce ball to hit the ground, given that the acceleration due to gravity is 9.8 meters per second per second?
s(t)=-4.9t^2 + 9.8 = 0
Solved for t
-4.9t^2 = -9.8
I had to enter my answer into a computer checking system, and it says that my answer is wrong. What am I doing wrong?