document.write( "Question 255611: The inital height a ball is thrown in the air is 80 feet, velocity 64 ft. per sec. and g is 32 feet/sec squared. I am supposed to figure out when it will hit the ground in 2 different ways. \n" ); document.write( "

Algebra.Com's Answer #187825 by stanbon(75887) $\"\"$ $\"About$

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The initial height a ball is thrown in the air is 80 feet, velocity 64 ft. per sec. and g is 32 feet/sec squared. I am supposed to figure out when it will hit the ground in 2 different ways.
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\n" ); document.write( "h(t) = -16t^2 + vot + so
\n" ); document.write( "---
\n" ); document.write( "The height is zero when the ball hits the ground:
\n" ); document.write( "Solve -16t^2+64t+80 = 0
\n" ); document.write( "Divide thru be -16 to get:
\n" ); document.write( "t^2 - 4t -5 = 0
\n" ); document.write( "Factor:
\n" ); document.write( "(t-5)(t+1) = 0
\n" ); document.write( "Positive solution:
\n" ); document.write( "t = 5 seconds
\n" ); document.write( "-------------------------
\n" ); document.write( "Graph the equations to see when the ball hits the ground:
\n" ); document.write( " $\"graph%28400%2C300%2C-10%2C10%2C-10%2C140%2C-16x%5E2%2B64x%2B80%29\"$
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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