document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1125995>Question 1125995</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rock is thrown upward from a bridge that is 95 feet above a road. The rock reaches its maximum height above the road 0.87 seconds after it is thrown and contacts the road 3.36 seconds after it was thrown.\r<BR>\n" );
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document.write( "Write a function f that determines the rock's height above the road (in feet) in terms of the number of seconds t since the rock was thrown.\r<BR>\n" );
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document.write( "-f(t)= </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #742331 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=742331\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> With motion problems, the leading coefficient is -16 in English system of units<BR>\n" );
document.write( "-16x^2+zx+95<BR>\n" );
document.write( "the maximum height occurs at 0.87 seconds, so -b/2a is maximum height time<BR>\n" );
document.write( "or -z/32=0.87, and z=27.84\r<BR>\n" );
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document.write( "Look at the function of -16x^2+27.84x+95<BR>\n" );
document.write( "maximum height is 107.1 feet\r<BR>\n" );
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document.write( "It takes 2.59 seconds to fall 107.1 feet. That makes it 3.46 seconds before it hits. </SPAN>\n" );
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