A catapult launches a boulder with an upward velocity of 92 m/s. The height of the boulder, h, in meters after 1 seconds is given in the function h= -5t^2+92t+16. How many seconds does it take to reach maximum height? What is the boulders maximum height?

Answer 1

Sorry

I think that it is 439.20 meters in 9.2 seconds

Answer 2

the t of the vertex is -b/(2a) = -92/-10 = 9.2
you had that

sub in t = 9/2,
h = 439.2

you were right, good job