document.write( "Question 108448This question is from textbook Beginning Algebra
\n" ); document.write( ": Science and Medicine. Find the time required for an object to fall to the ground from a building that is 1400 feet high. (Use the formula found in exercise 67.)\r
\n" ); document.write( "\n" ); document.write( "The formula in exercise 67:
\n" ); document.write( "t=1/4 square root s, in which s is the distance fallen.\r
\n" ); document.write( "\n" ); document.write( "I know the equation would look like this:\r
\n" ); document.write( "\n" ); document.write( "t=1/4 square root 1400\r
\n" ); document.write( "\n" ); document.write( "I don't know how to go about solving this equation. Can you help? \n" ); document.write( "
Algebra.Com's Answer #79093 by stanbon(75887)\"\" \"About 
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Find the time required for an object to fall to the ground from a building that is 1400 feet high.
\n" ); document.write( "----------
\n" ); document.write( "h(t) = -16t^2+ 1400
\n" ); document.write( "h(t) is the height of the object at time t-seconds
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\n" ); document.write( "When the object hits the ground its height is zero.
\n" ); document.write( "Let h(t) = 0 and solve for \"t\":
\n" ); document.write( "-16t^2 + 1400 = 0
\n" ); document.write( "16t^2 = 4000
\n" ); document.write( "t^2 = 4000/16
\n" ); document.write( "t = sqrt(4000)/4
\n" ); document.write( "t = 20sqrt(10)/4
\n" ); document.write( "t = 5sqrt(10)
\n" ); document.write( "t is approximately 15.81 seconds
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "
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