SOLUTION: Just need some help setting this one up please, I believe it should be a quadratic equation but not quite sure. ok here it is: A ball is thrown vertically upward from the ground. I

Question 29459: Just need some help setting this one up please, I believe it should be a quadratic equation but not quite sure. ok here it is: A ball is thrown vertically upward from the ground. Its distance in feet from the ground in t seconds is -16t^2+112t. After how many seconds will the ball be 160 feet from the ground? I was thinking it should be set up as -16t^2+112t-160=0 Thanks for your help!!
Answer by longjonsilver(2297) (Show Source): You can put this solution on YOUR website!
distance = , so we have

so
or
or

then factorise... 5 and 2 etc.

you will get 2 answers. What does getting 2 times mean physically?

jon.

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