document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1189951>Question 1189951</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, these are physics problems. Help please<BR>\n" );
document.write( "1. A 0.22 kg red striped pool ball is moving at 3.0 m/s North and it collides with a white cue ball that is 0.25 kg and it is moving at 1.0 m/s South. After the collision, the red striped ball continues at 2.5 m/s North.  What is the velocity of the white cue ball?<BR>\n" );
document.write( "2. Two skaters are skating towards each other. The 75.0 kg man is moving at 2.0 m/s to the right, and he picks up the 40.0 kg woman skater who is moving at  -  1.5 m/s to the left.  What speed and direction do they move off together (assuming no friction on the ice)? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #821474 by </B><A HREF=/tutors/aboutme.mpl?userid=mananth><B>mananth(16946)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mananth><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=mananth><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=821474\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <BR>\n" );
document.write( "A 0.22 kg red striped pool ball is moving at 3.0 m/s North and it collides with a white cue ball that is 0.25 kg and it is moving at 1.0 m/s South. After the collision, the red striped ball continues at 2.5 m/s North.  What is the velocity of the white cue ball?\r<BR>\n" );
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document.write( "Law of conservation of momentum.<BR>\n" );
document.write( "Momentum before collision = momentum after collision<BR>\n" );
document.write( "Mass of ball I m1<BR>\n" );
document.write( "Initial velocity u1 <BR>\n" );
document.write( "Mass of ball II m2<BR>\n" );
document.write( "initial velocity v2\r<BR>\n" );
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document.write( "initial momentum = m1u1+m2u2\r<BR>\n" );
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document.write( "After collision the momentum will be<BR>\n" );
document.write( "m1v1 + m2v2<BR>\n" );
document.write( "v1 velocity of ball I after collision<BR>\n" );
document.write( "v2 velocity of ball II after collision x\r<BR>\n" );
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document.write( "0.22 * 3 + 0.25 * 1 = 0.22*2.5 + 0.25 *x\r<BR>\n" );
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document.write( "0.66 + 0.25 = 0.550 +0.25x\r<BR>\n" );
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document.write( "0.91 -0.55 = 0.25x<BR>\n" );
document.write( "0.36= 0.25x\r<BR>\n" );
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document.write( "x = 1.44 m/s  ( Ball II)\r<BR>\n" );
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document.write( "Problem II similar\r<BR>\n" );
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document.write( "m1u1+m2u2 = (m1+m2) *v <BR>\n" );
document.write( "They have common velocity after they meet.\r<BR>\n" );
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document.write( "2. Two skaters are skating towards each other. The 75.0 kg man is moving at 2.0 m/s to the right, and he picks up the 40.0 kg woman skater who is moving at  -  1.5 m/s to the left.  What speed and direction do they move off together (assuming no friction on the ice)? </SPAN>\n" );
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