a flare is fired upwards from the deck of a chip. The flar hits the water. The height of the flare, h, in metres, above the water t seconds is given by the function h= -4.9t^2 + 98t + 8
a. How long does it take the flare to hit the water?
b.How high is the deck of the ship above the water?
I calculated the height of the flare as 498m through completing the square, and i calculated the time to reach maximum height as 10 seconds. But now I'm stuck.
Can anyone help me plz!!