document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1131229>Question 1131229</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An accident investigator measured the skid marks of one of the vehicles involved in an accident. The length of the skid marks was 175 feet. What was the speed of the vehicle before the brakes were applied? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #747861 by </B><A HREF=/tutors/aboutme.mpl?userid=MathLover1><B>MathLover1(20850)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=MathLover1><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=MathLover1><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=747861\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> There is not enough information to answer the question.  If we knew the rate of the constant acceleration \"a\" caused by application of the brakes (which in this problem is a negative number), we could get the initial speed from the kinematic relation<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v%5E2+-+v%5B0%5D%5E2+=+2ad ALIGN=MIDDLE  ALT=\"v%5E2+-+v%5B0%5D%5E2+=+2ad\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v ALIGN=MIDDLE  ALT=\"v\"   DISABLED_style= \"max-width:90%; height:auto;\" > = final speed = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0 ALIGN=MIDDLE  ALT=\"0\"   DISABLED_style= \"max-width:90%; height:auto;\" > (came to a full stop)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v%5B0%5D+ ALIGN=MIDDLE  ALT=\"v%5B0%5D+\"   DISABLED_style= \"max-width:90%; height:auto;\" >= initial speed (what you want to solve for)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d+ ALIGN=MIDDLE  ALT=\"d+\"   DISABLED_style= \"max-width:90%; height:auto;\" >= stopping distance = <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=175 ALIGN=MIDDLE  ALT=\"175\"   DISABLED_style= \"max-width:90%; height:auto;\" > feet<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v%5B0%5D+=+sqrt%28-2ad%29 ALIGN=MIDDLE  ALT=\"v%5B0%5D+=+sqrt%28-2ad%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >  [Remember <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a ALIGN=MIDDLE  ALT=\"a\"   DISABLED_style= \"max-width:90%; height:auto;\" > is negative, so the argument of the square root is positive.]<BR>\n" );
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document.write( "But as you can see, we need the acceleration <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=a ALIGN=MIDDLE  ALT=\"a\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
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document.write( "If we knew the time it took to come to a full stop, we could still answer the question.  Either way, we need more information than just the stopping distance.\r<BR>\n" );
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