document.write( "Question 175007: Suppose Charlie O’Brian of the Braves hits a baseball straight upward at 150 ft/sec from a height of 5 ft. \r
\n" ); document.write( "\n" ); document.write( "Use the formula to determine how long it takes the ball to return to the earth.
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Algebra.Com's Answer #130101 by stanbon(75887)\"\" \"About 
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Charlie O’Brian of the Braves hits a baseball straight upward at 150 ft/sec from a height of 5 ft.
\n" ); document.write( "Use the form-ula to determine how long it takes the ball to return to the earth.
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\n" ); document.write( "h(t) = -16t^2 + vo(t) + so
\n" ); document.write( "Your problem:
\n" ); document.write( "h(t) = -16t^2 + 150t + 5
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\n" ); document.write( "Height is zero when the ball hits the ground.\r
\n" ); document.write( "\n" ); document.write( "0 = -16t^2 + 150t + 5\r
\n" ); document.write( "\n" ); document.write( "t = [-150 +- sqrt(150^2 -4*-16*5)]/[-32]
\n" ); document.write( "Positive solution:\r
\n" ); document.write( "\n" ); document.write( "t = 9.41 seconds\r
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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