document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1100940>Question 1100940</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A projectile is thrown upward so that its distance above the ground after t seconds is h = -16t2 + 440t.\r<BR>\n" );
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document.write( "After how many seconds does it reach its maximum height? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #715891 by </B><A HREF=/tutors/aboutme.mpl?userid=amalm06><B>amalm06(224)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=amalm06><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=amalm06><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=715891\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Position=h=-16t2 + 440t\r<BR>\n" );
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document.write( "Velocity=dh/dt=-32t+440\r<BR>\n" );
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document.write( "At its maximum height, the velocity of the projectile is zero:\r<BR>\n" );
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document.write( "-32t+440=0<BR>\n" );
document.write( "     440=32t<BR>\n" );
document.write( "       t=13.75 s (Answer)<BR>\n" );
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