document.write( "Question 1066936: An object is thrown upward from the top of a 160​-foot building with an initial velocity of 144 feet per second. The height h of the object after t seconds is given by the quadratic equation h= −16t^2+144t+160. When will the object hit the​ ground? \n" ); document.write( "
Algebra.Com's Answer #682155 by ankor@dixie-net.com(22740)\"\" \"About 
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An object is thrown upward from the top of a 160​-foot building with an initial velocity of 144 feet per second.
\n" ); document.write( " The height h of the object after t seconds is given by the quadratic equation h= −16t^2+144t+160.
\n" ); document.write( " When will the object hit the​ ground?
\n" ); document.write( ":
\n" ); document.write( "When the objects hits the ground, h=0 therefore we can write this:
\n" ); document.write( "-16t^2 + 144t + 160 = 0
\n" ); document.write( "Solve for t
\n" ); document.write( "We can simplify this, divide thru by -16, resulting in:
\n" ); document.write( "t^2 - 9t - 10t = 0
\n" ); document.write( "Factors easily to
\n" ); document.write( "(t-10)(t+1) = 0
\n" ); document.write( "The positive solution
\n" ); document.write( "t = 10 seconds is the time from thrown to hitting the ground \n" ); document.write( "
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