document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=144915>Question 144915</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve:\r<BR>\n" );
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document.write( "If an object is thrown upward with an initial velocity of 64 ft/sec, its height after t sec is given by h = 64t - 16t2. Find the number of seconds the object is in the air before it hits the ground. \r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #105620 by </B><A HREF=/tutors/aboutme.mpl?userid=nabla><B>nabla(475)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nabla><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=105620\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 0=64t-16t^2<BR>\n" );
document.write( "0=-16t(t-4)\r<BR>\n" );
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document.write( "Implies t=0 or t=4.\r<BR>\n" );
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document.write( "We exclude t=0, leaving t=4 the only solution.\r<BR>\n" );
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document.write( "Check:\r<BR>\n" );
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document.write( "64(4)-16(4^2)=256-256=0. </SPAN>\n" );
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