document.write( "Question 871465: Anyone can help?\r
\n" ); document.write( "\n" ); document.write( "If a ball is shot upward from ground level with an initial velocity of 136 feet per second, after t seconds, its height h in feet is given by the formula h=-16t^2 + 136t. After how many seconds will it hit the ground? \n" ); document.write( "
Algebra.Com's Answer #525537 by mananth(16946)\"\" \"About 
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If a ball is shot upward from ground level with an initial velocity of 136 feet per second, after t seconds, its height h in feet is given by the formula h=-16t^2 + 136t. After how many seconds will it hit the ground?\r
\n" ); document.write( "\n" ); document.write( "If a ball is shot upward from ground level with an initial velocity of 136 feet per second, after t seconds, its height h in feet is given by the formula \r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "h=-16t^2 + 136t.
\n" ); document.write( "At two times the ball will be on ground\r
\n" ); document.write( "\n" ); document.write( "once when starting and once when it lands\r
\n" ); document.write( "\n" ); document.write( "h=0
\n" ); document.write( "h=-16t^2 + 136t.
\n" ); document.write( "16t^2=136t
\n" ); document.write( "t=136/16
\n" ); document.write( "t=17/2
\n" ); document.write( "t=8.5 seconds \n" ); document.write( "
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