document.write( "Question 440852: A Ball is thrown upward from a height of 15 ft. with an initial upward velocity of 5 ft a sec. Use the formula h=-16t squared+vt+s to find out how long it will take for the ball to hit the ground? \n" ); document.write( "
Algebra.Com's Answer #304427 by stanbon(75887)\"\" \"About 
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A Ball is thrown upward from a height of 15 ft. with an initial upward velocity of 5 ft a sec. Use the formula h=-16t squared+vt+s to find out how long it will take for the ball to hit the ground?
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\n" ); document.write( "h=-16t squared+vt+s
\n" ); document.write( "h(t) = -16t^2+5t+15
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\n" ); document.write( "Height is zero when the ball hits the ground:
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\n" ); document.write( "Solve: -16t^2+5t+15 = 0
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\n" ); document.write( "Use Quadratic Formula:
\n" ); document.write( "t = [-5 +- sqrt(25-4*-16*15)]/(-32)
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\n" ); document.write( "t = [-5 +- sqrt(985)]/(-32)
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\n" ); document.write( "Positive solution:
\n" ); document.write( "t = [-5-31.38]/(-32)
\n" ); document.write( "t = 1.1370 seconds
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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