document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=326995>Question 326995</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The stopping distance d of a car after the brakes are applied varies directly as the square of the speed r.  If a car travelling 70 mph can stop in 270 ft, how many feet will it take the same car to stop when it is travelling 20 mph.  <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #234484 by </B><A HREF=/tutors/aboutme.mpl?userid=jvan><B>jvan(28)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jvan><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=234484\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let's write an equation for this problem, \"stopping distance d of a car after the brakes are applied varies directly as the square of the speed r\": <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=c%2Ar%5E2 ALIGN=MIDDLE  ALT=\"d=c%2Ar%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >. With c being the constant. Plugging in 70mph and 270feet you get: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=270feet=c%2A%2870%5E2%29 ALIGN=MIDDLE  ALT=\"270feet=c%2A%2870%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Divide both sides by 70^2 to get c=0.055. Now that you have found c, let's find the stopping distance of the car if it where traveling at 20mph. The equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=270=c%2A%2870%5E2%29 ALIGN=MIDDLE  ALT=\"270=c%2A%2870%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > becomes <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=0.055%2A%2820%5E2%29 ALIGN=MIDDLE  ALT=\"d=0.055%2A%2820%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > after you plug in the c and r. Then you find that <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=d=22+feet ALIGN=MIDDLE  ALT=\"d=22+feet\"   DISABLED_style= \"max-width:90%; height:auto;\" >. Hope this helps :D!!!!<BR>\n" );
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