document.write( "Question 215162: A ball is thrown upward from ground level with an initial velocity of 108 ft per sec. Its height H in feet after T seconds is given by the equation $\"+++H=+-16T%5E2+%2B+108T\"$ . At what time will the ball hit the ground? \n" ); document.write( "

Algebra.Com's Answer #162572 by Edwin McCravy(20056) $\"\"$ $\"About$

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A ball is thrown upward from ground level with an initial velocity of 108 ft per sec. Its height H in feet after T seconds is given by the equation $\"+++H=+-16T%5E2+%2B+108T\"$ . At what time will the ball hit the ground?
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document.write( "When the ball hits the ground, its height above the ground equals zero. \r\n" );
document.write( "So just substitute H=0 and  \r\n" );
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document.write( "Substituting,\r\n" );
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document.write( "Adding  to both sides:\r\n" );
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document.write( "Factor  out of the left side:\r\n" );
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document.write( "Set each factor = 0:\r\n" );
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document.write( "which means the ball is on the ground when time is 0,\r\n" );
document.write( "that is, before the ball first starts upward, and again at when\r\n" );
document.write( "when it comes back down to the ground 2.6 seconds later.\r\n" );
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document.write( "Edwin

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