document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=715228>Question 715228</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The average velocity is equal to the average of the initial and final velocities ONLY if the acceleration is constant. In general, average velocity is given by the change in displacement divided by the time interval.<BR>\n" );
document.write( "Average speed is given by the total distance traveled divided by the total time. <BR>\n" );
document.write( "Suppose you travel up a hill at 40 miles/hour and then return down the hill at 60 miles/hour. <BR>\n" );
document.write( "a) What was your average speed for the round trip journey?<BR>\n" );
document.write( "b) What was your average velocity?\r<BR>\n" );
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document.write( "My work for part a:<BR>\n" );
document.write( "average speed= (40 mi/hr + 60 mi/hr)/2 = 50 mi/hr\r<BR>\n" );
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document.write( "Is my work right? Also, how would part b be solved? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #439322 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=439322\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The average velocity is equal to the average of the initial and final velocities ONLY if the acceleration is constant.<BR>\n" );
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document.write( "Suppose you travel up a hill at 40 miles/hour and then return down the hill at 60 miles/hour.<BR>\n" );
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document.write( "Distance up = Distance down = x miles<BR>\n" );
document.write( "time up = x/40 mph <BR>\n" );
document.write( "time down = x/60 mph<BR>\n" );
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document.write( "Average speed is given by the total distance traveled divided by the total time.  <BR>\n" );
document.write( "a) What was your average speed for the round trip journey?<BR>\n" );
document.write( "= total distance/total time = 2x/(x/40 + x/60) = 2x/(100x/2400) = 2*24 = 48 mph<BR>\n" );
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document.write( "In general, average velocity is given by the change in displacement divided by the time interval.<BR>\n" );
document.write( "b) What was your average velocity?<BR>\n" );
document.write( "= 0/(x/40 - x/60) = 0/(20x/2400) = 0 <BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "=============<BR>\n" );
document.write( " </SPAN>\n" );
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