document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=169699>Question 169699</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Can someone please help me with this question?<BR>\n" );
document.write( "An airplane lands on a runway that is 250 m long. Assume that it uses all of that length to stop and that its velocity upon touchdown is 65 m/s. What is the acceleration of the plane?<BR>\n" );
document.write( "My choices are:<BR>\n" );
document.write( "a. 0.13 m/s^2<BR>\n" );
document.write( "b -0.13 m/s^2<BR>\n" );
document.write( "c. 8.45 m/s^2<BR>\n" );
document.write( "d.-8.45 m/s^2<BR>\n" );
document.write( "Thanks so much for your help =) !!!!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #125101 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=125101\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the initial velocity is 65m/s and the final velocity is zero, so the average velocity is 32.5m/s\r<BR>\n" );
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document.write( "the time to stop is 250m / 32.5m/s or 7.69s\r<BR>\n" );
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document.write( "the acceleration is 65m/s / 7.69s or 8.45m/s^2\r<BR>\n" );
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document.write( "since the acceleration is opposite to the direction of motion (deceleration), it is NEGATIVE </SPAN>\n" );
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