document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=969827>Question 969827</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown upward from a height of 15 feet with an initial velocity of 5 ft/s. use the formula h(t) = -16t^2 + 5t + 15. How long will it take the ball to reach it's maximum height and how long will it take the ball to hit the ground? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #592570 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=592570\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A ball is thrown upward from a height of 15 feet with an initial velocity of 5 ft/s. use the formula h(t) = -16t^2 + 5t + 15. How long will it take the ball to reach it's [sic] maximum height and how long will it take the ball to hit the ground?<BR>\n" );
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document.write( "The max ht is the vertex of the parabola,<BR>\n" );
document.write( "at t = -b/2a<BR>\n" );
document.write( "t = -5/-32 = 5/32 seconds<BR>\n" );
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document.write( "It hits the ground then h(t) = 0<BR>\n" );
document.write( "-16t^2 + 5t + 15 = 0<BR>\n" );
document.write( "Solve for t. Ignore the negative solution.<BR>\n" );
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