document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=234421>Question 234421</A>: <I><SPAN STYLE=\"word-break: break-all;\"> use 4.9t^2 + vot = s\r<BR>\n" );
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document.write( "a coin is tossed downward with an initial velocity of 30 meters per second(v0)at an altitude of 402 meters(s). approximetly how long does it take the coin to reach 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 #172843 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=172843\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> use 4.9t^2 + vot = s \r<BR>\n" );
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document.write( "a coin is tossed downward with an initial velocity of 30 meters per second(v0)at an altitude of 402 meters(s). approximately how long does it take the coin to reach the ground?<BR>\n" );
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document.write( "-4.9t^2-30t = -402 meters<BR>\n" );
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document.write( "4.9t^2 + 30t -402 = 0<BR>\n" );
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document.write( "Use Quadratic formula:<BR>\n" );
document.write( "t = [-30 +- sqrt(900 - 4*4.9*-402)]/(9.8)<BR>\n" );
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document.write( "t = [-30 +- sqrt(8779.2)]/9.8<BR>\n" );
document.write( "Positive solution:<BR>\n" );
document.write( "t = [-30+93.7]/9.2<BR>\n" );
document.write( "t = 6.924 seconds<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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