SOLUTION: The height h in feet of a golf ball after t seconds is given by h=48t-16t^2. How long did it take for the ball to hit the ground? Help please!

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Question 340299: The height h in feet of a golf ball after t seconds is given by h=48t-16t^2. How long did it take for the ball to hit the ground?
Help please!
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
h=48t-16t^2. How long did it take for the ball to hit the ground?
48t-16t^2 = 0 when it hits the ground
16t(3-t)=0
so t= 3 seconds