h=-16t^2+38t+5

Question

An object has been thrown straight up into the air. The formula 

h = vt − 16t2

 gives the height h of the object above the ground after t seconds, when it is thrown upward with an initial velocity v. 

Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by

h = −16t2 + 38t + 5.

How long will the coin be in the air?
t =  ? sec

Answer 1

345666 fat assssss

Answer 2

t=2.5 sec

Answer 3

2.5 seconds