document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=126872>Question 126872</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395535891/algebrahomeworkh>algebra 1</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> use the formula h = rt - 4.9t2\r<BR>\n" );
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document.write( "a projectile is fired upward with an initial speed of 2940 m/s.  After how many minutes does it hit the ground?\r<BR>\n" );
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document.write( "how do we figure this out?  we are stuck!   thanks </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #92972 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=92972\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h%28t%29=rt+-+4.9t%5E2 ALIGN=MIDDLE  ALT=\"h%28t%29=rt+-+4.9t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "I'm assuming that r is the initial speed in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2Fs ALIGN=MIDDLE  ALT=\"m%2Fs\"   DISABLED_style= \"max-width:90%; height:auto;\" >. <BR>\n" );
document.write( "Also, I'm assuming that the units of 4.9 are <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m%2Fs%5E2 ALIGN=MIDDLE  ALT=\"m%2Fs%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "That's your gravity terms (1/2 g). <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h%28t%29=2940t+-+4.9t%5E2 ALIGN=MIDDLE  ALT=\"h%28t%29=2940t+-+4.9t%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "At time t=0 seconds, the projectile is on the ground, about to be fired. <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h%280%29=2940%280%29-4.9%280%29%5E2 ALIGN=MIDDLE  ALT=\"h%280%29=2940%280%29-4.9%280%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=h%280%29=0 ALIGN=MIDDLE  ALT=\"h%280%29=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "You need to find the next time h(t)=0. <BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2940t-4.9t%5E2=0 ALIGN=MIDDLE  ALT=\"2940t-4.9t%5E2=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2940-4.9t=0 ALIGN=MIDDLE  ALT=\"2940-4.9t=0\"   DISABLED_style= \"max-width:90%; height:auto;\" >Divide both sides by (t).<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2940=4.9t ALIGN=MIDDLE  ALT=\"2940=4.9t\"   DISABLED_style= \"max-width:90%; height:auto;\" >Add (4.9t) to both sides<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=2940%2F4.9 ALIGN=MIDDLE  ALT=\"t=2940%2F4.9\"   DISABLED_style= \"max-width:90%; height:auto;\" >Divide both sides by (4.9).<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=t=600 ALIGN=MIDDLE  ALT=\"t=600\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "In 600 seconds, the projectile will hit the ground. <BR>\n" );
document.write( "600 seconds = 10 minutes. <BR>\n" );
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