# SOLUTION: h=-16t^2+48t+160 how many seconds til it hits the ground?

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 Click here to see ALL problems on Polynomials-and-rational-expressions Question 44144: h=-16t^2+48t+160 how many seconds til it hits the ground?Answer by adamchapman(301)   (Show Source): You can put this solution on YOUR website!h= height when it hits the ground, h=0. So: Use the quadratic solver where a=-16 b=48 c=160 Now: So t=-2 or t=5 t=-2 would mean going back in time, which i think is impossible, so th must be 5 seconds. I have graphed heigt with time below. This should confirm that h=0 when t=5. I hope this helps P.S. I am trying to start up my own homework help website. I would be extremely grateful if you would e-mail me some feedback on the help you received to adam.chapman@student.manchester.ac.uk