document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1151830>Question 1151830</A>: <I><SPAN STYLE=\"word-break: break-all;\"> fireworks are shot upward with an initial velocity of 128 feet per second from a platform that is 3 feet above the ground. What is the peak of the fireworks? When does it get to the peak. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #773686 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=773686\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> fireworks are shot upward with an initial velocity of 128 feet per second from a platform that is 3 feet above the ground. What is the peak of the fireworks? When does it get to the peak.<BR>\n" );
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document.write( "Using 32 ft/sec/sec for gravity:<BR>\n" );
document.write( "h(t) = -16t^2 + 128t + 3<BR>\n" );
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document.write( "The peak is the vertex of the parabola at t = -b/2a<BR>\n" );
document.write( "t = -128/(-32) = 4 seconds<BR>\n" );
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document.write( "Peak = h(4) = -16*4^2 + 128*4 + 3<BR>\n" );
document.write( "Peak = 259 feet<BR>\n" );
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