document.write( "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? \n" ); document.write( "

Algebra.Com's Answer #491686 by ewatrrr(24785) $\"\"$ $\"About$

You can put this solution on YOUR website!

 
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document.write( "Hi,
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document.write( "An object is thrown upward from the top of a 144-foot building with and initial velocity of 128 feet per second.
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document.write( " h = -16t^2+128t+144. when will the object hit the ground? when h = 0
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document.write( " -16t^2+128t+144 = 0
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document.write( "  t^2 -8t - 9 = 0
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document.write( " (t-9)(t+1) = 0,  t = 9sec
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