document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=818258>Question 818258</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A car is stopped on a road. Another car hits the car from behind and pushes the stopped car to 20 mph. How fast was the moving car going? The car hit did not  Apply brakes. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #492437 by </B><A HREF=/tutors/aboutme.mpl?userid=KMST><B>KMST(5328)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=KMST><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=KMST><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=492437\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> That is a physics problem, and you do not have enough information.<BR>\n" );
document.write( "You could apply conservation of momentum and conservation of energy if there is no braking.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=M%2AV%5Bi%5D=M%2AV%5Bf%5D%2Bm%2A20 ALIGN=MIDDLE  ALT=\"M%2AV%5Bi%5D=M%2AV%5Bf%5D%2Bm%2A20\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=M%2AV%5Bi%5D%5E2%2F2=M%2AV%5Bf%5D%5E2%2F2%2Bm%2A20%5E2%2F2 ALIGN=MIDDLE  ALT=\"M%2AV%5Bi%5D%5E2%2F2=M%2AV%5Bf%5D%5E2%2F2%2Bm%2A20%5E2%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "where<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=M ALIGN=MIDDLE  ALT=\"M\"   DISABLED_style= \"max-width:90%; height:auto;\" >=mass of moving car<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m ALIGN=MIDDLE  ALT=\"m\"   DISABLED_style= \"max-width:90%; height:auto;\" >= mass of stopped car<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=V%5Bi%5D ALIGN=MIDDLE  ALT=\"V%5Bi%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >= initial speed of moving car<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=V%5Bf%5D ALIGN=MIDDLE  ALT=\"V%5Bf%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >= final speed of moving car after the collision<BR>\n" );
document.write( "However, you do not know the masses of the cars.<BR>\n" );
document.write( "I do not think it can be solved without further information, but I am going to review my physics course to see if and what additional information would be needed.<BR>\n" );
document.write( "Was it a fully inelastic collision, where both cars ended up moving together as one so <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=V%5Bf%5D=20 ALIGN=MIDDLE  ALT=\"V%5Bf%5D=20\"   DISABLED_style= \"max-width:90%; height:auto;\" >?<BR>\n" );
document.write( "Or were they bumper cars, and it was a fully elastic collision? </SPAN>\n" );
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