document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=190776>Question 190776</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please help me with this problem:\r<BR>\n" );
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document.write( "The speed of a 4000-kg truch whose KE is 1.8 MJ is:\r<BR>\n" );
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document.write( "a. 0.95 m/s<BR>\n" );
document.write( "b. 30 m/s<BR>\n" );
document.write( "c. 94 m/s<BR>\n" );
document.write( "d. 900 m/s </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #143262 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=143262\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> I'm assuming that you've been given the kinetic energy formula: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=KE=%281%2F2%29mv%5E2 ALIGN=MIDDLE  ALT=\"KE=%281%2F2%29mv%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > where \"KE\" is the kinetic energy (think of it as the energy it has when it is moving), \"m\" is the mass, and \"v\" is the velocity\r<BR>\n" );
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document.write( "Note: the units for the three variables are:\r<BR>\n" );
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document.write( "KE: joules (j)\r<BR>\n" );
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document.write( "m: kilograms (kg)\r<BR>\n" );
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document.write( "v: meters per second (m/s)\r<BR>\n" );
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document.write( "the units in this problem are very important\r<BR>\n" );
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document.write( "First, take note that 4000 kg in scientific notation is written as <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=4%2A10%5E3 ALIGN=MIDDLE  ALT=\"m=4%2A10%5E3\"   DISABLED_style= \"max-width:90%; height:auto;\" > kilograms\r<BR>\n" );
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document.write( "Also, 1.8 MJ (1.8 megajoules) can be written as 1,800,000 joules, which is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.8%2A10%5E6 ALIGN=MIDDLE  ALT=\"1.8%2A10%5E6\"   DISABLED_style= \"max-width:90%; height:auto;\" > joules. So the kinetic energy is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=KE=1.8%2A10%5E6 ALIGN=MIDDLE  ALT=\"KE=1.8%2A10%5E6\"   DISABLED_style= \"max-width:90%; height:auto;\" > joules.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=KE=%281%2F2%29mv%5E2 ALIGN=MIDDLE  ALT=\"KE=%281%2F2%29mv%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Start with the given formula\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.8%2A10%5E6=%281%2F2%29%284%2A10%5E3%29v%5E2 ALIGN=MIDDLE  ALT=\"1.8%2A10%5E6=%281%2F2%29%284%2A10%5E3%29v%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Plug in <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=KE=1.8%2A10%5E6 ALIGN=MIDDLE  ALT=\"KE=1.8%2A10%5E6\"   DISABLED_style= \"max-width:90%; height:auto;\" > and <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=m=4%2A10%5E3 ALIGN=MIDDLE  ALT=\"m=4%2A10%5E3\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1.8%2A10%5E6=%282%2A10%5E3%29v%5E2 ALIGN=MIDDLE  ALT=\"1.8%2A10%5E6=%282%2A10%5E3%29v%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Multiply <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=1%2F2 ALIGN=MIDDLE  ALT=\"1%2F2\"   DISABLED_style= \"max-width:90%; height:auto;\" > by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2A10%5E3 ALIGN=MIDDLE  ALT=\"4%2A10%5E3\"   DISABLED_style= \"max-width:90%; height:auto;\" > to get <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2A10%5E3 ALIGN=MIDDLE  ALT=\"2%2A10%5E3\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%281.8%2A10%5E6%29%2F%282%2A10%5E3%29=v%5E2 ALIGN=MIDDLE  ALT=\"%281.8%2A10%5E6%29%2F%282%2A10%5E3%29=v%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2A10%5E3 ALIGN=MIDDLE  ALT=\"2%2A10%5E3\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=900=v%5E2 ALIGN=MIDDLE  ALT=\"900=v%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Divide\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v%5E2=900 ALIGN=MIDDLE  ALT=\"v%5E2=900\"   DISABLED_style= \"max-width:90%; height:auto;\" > Rearrange the equation\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v=sqrt%28900%29 ALIGN=MIDDLE  ALT=\"v=sqrt%28900%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Take the square root of both sides (we're only interested in the positive square root)\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=v=30 ALIGN=MIDDLE  ALT=\"v=30\"   DISABLED_style= \"max-width:90%; height:auto;\" > Take the square root of 900 to get 30\r<BR>\n" );
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document.write( "So the velocity is 30 m/s </SPAN>\n" );
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