document.write( "Question 628334: A football is kicked straight up from a height of 4 feet with an initial speed of 50 feet per second. The formula H= -16t squared +50t+4 describes the ball's height above the ground, h, in feet, t seconds after it was kicked. How long will it take for the football to hit the ground? \n" ); document.write( "

Algebra.Com's Answer #395606 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A football is kicked straight up from a height of 4 feet with an initial
\n" ); document.write( " speed of 50 feet per second
\n" ); document.write( "The formula H= -16t squared +50t+4 describes the ball's height above the
\n" ); document.write( " ground, h, in feet, t seconds after it was kicked.
\n" ); document.write( " How long will it take for the football to hit the ground?\
\n" ); document.write( ":
\n" ); document.write( "When the ball hits the ground h = 0, therefore
\n" ); document.write( ":
\n" ); document.write( "-16t^2 + 50t + 4 = 0
\n" ); document.write( "Solve this using the quadratic formula
\n" ); document.write( " $\"t+=+%28-50+%2B-+sqrt%2850%5E2-4%2A-16%2A4+%29%29%2F%282%2A-16%29+\"$
\n" ); document.write( "you should get a positive solution of t ~ 3.2 seconds \n" ); document.write( "

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