SOLUTION: An object is thrown upward from the top of a 144-foot building with and initial velocity of 128 feet per second. the height h of the object t secnds is given by the quadratic equat

Question 816725: An object is thrown upward from the top of a 144-foot building with and initial velocity of 128 feet per second. the height h of the object t secnds is given by the quadratic equation h=-16t^2+128t+144. when will the object hit the ground?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

An object is thrown upward from the top of a 144-foot building with and initial velocity of 128 feet per second.

 h = -16t^2+128t+144. when will the object hit the ground? when h = 0

 -16t^2+128t+144 = 0

  t^2 -8t - 9 = 0

 (t-9)(t+1) = 0,  t = 9sec

  



 

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