document.write( "Question 118277: A ball is thrown upward from the to of a 98-meter tower with an initial speed of 39.2 m/s. How much later will it hit the ground? Hint: If h is the height of the ball above the top of the tower, then h=98 when the ball hits the ground \n" ); document.write( "
Algebra.Com's Answer #86400 by stanbon(75887)\"\" \"About 
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A ball is thrown upward from the to of a 98-meter tower with an initial speed of 39.2 m/s. How much later will it hit the ground? Hint: If h is the height of the ball above the top of the tower, then h=98 when the ball hits the ground.
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\n" ); document.write( "Formula: h(t) = -9.81t^2+vot+s(o)
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\n" ); document.write( "Your Problem:
\n" ); document.write( "h(t) = -9.81t^2+39.2t+98
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\n" ); document.write( "Comment: Usually \"hit the ground\" means h=0, not h=98.
\n" ); document.write( "I'm going to assume you mean h=0.
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\n" ); document.write( "-9.81t^2+39.2t+98=0
\n" ); document.write( "t = [-39.2 +- sqrt(39.2^2-4*-9.81*98)]/[2*-9.81]
\n" ); document.write( "t = [-39.2 +- 73.36]/[-19.62]
\n" ); document.write( "t = 5.74 seconds
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.\r
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