document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=439458>Question 439458</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please help me with this problem? Thank you so much.\r<BR>\n" );
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document.write( "The braking distance D in feet required to stop a car traveling x mph on dry, level pavement can be approximated by D= 1/9x^2<BR>\n" );
document.write( "(a.) Calculate the braking distance for 30 mph and 60 mph. how do your answers compare?<BR>\n" );
document.write( "(b.) If the braking distance is 16 feet, estimate the speed of the car.<BR>\n" );
document.write( "(c.) Use a calculator to solve part (b) numerically. Do your answers agree?<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 #303715 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=303715\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The braking distance D in feet required to stop a car traveling x mph on dry, level pavement can be approximated by D= (1/9)x^2<BR>\n" );
document.write( "(a.) Calculate the braking distance for 30 mph and 60 mph. how do your answers compare?<BR>\n" );
document.write( "D(30) = (1/9)*30^2 = 100 ft.<BR>\n" );
document.write( "D(60) = (1/9)*60^2 = 400 ft.<BR>\n" );
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document.write( "(b.) If the braking distance is 16 feet, estimate the speed of the car.<BR>\n" );
document.write( "16 = (1/9)r^2<BR>\n" );
document.write( "r^2 = 16/9<BR>\n" );
document.write( "r = 4/3 mph  = 1 1/3 mph<BR>\n" );
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document.write( "(c.) Use a calculator to solve part (b) <BR>\n" );
document.write( "numerically. Do your answers agree?<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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