document.write( "Question 49930: If a pebble is dropped toward a pond from the top of a 360-ft building, its height, h, after t seconds is given by h = -16t^2 + 180. How long does it take the pebble to pass through a height of 60 feet? \n" ); document.write( "

Algebra.Com's Answer #33175 by stanbon(75887) $\"\"$ $\"About$

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h = -16t^2 + 180. How long does it take the pebble to pass through a height of 60 feet.
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\n" ); document.write( "\n" ); document.write( "60=-16t^2+180
\n" ); document.write( "16t^2=120
\n" ); document.write( "T^2=15/2
\n" ); document.write( "t=(sqrt30)/2 seconds or 2.739 seconds\r
\n" ); document.write( "\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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