document.write( "Question 1182248: If two rail cars crash together and hook up with each other, what will be the final velocity of the two cars. Car 1 has a mass of 52000 kg And initial velocity of + 0.150 mph car 2 has a mass of 7200 kg and an initial speed of + 0.050 mph solve by conservation of momentum\r
\n" ); document.write( "\n" ); document.write( "I did p=m*v car 1 p = ? m= 5000kg v= +0.150 mph
\n" ); document.write( "Car 2 p= ? m = 72000kg m = 0.050 mph
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Algebra.Com's Answer #812221 by ikleyn(52847) $\"\"$ $\"About$

You can put this solution on YOUR website!
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document.write( "In this problem, the both initial velocities are co-directed ( both are positive).\r\n" );
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document.write( "So you calculate the total moment p = ,\r\n" );
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document.write( "and then divide it by the total mass    of the glued objects.\r\n" );
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document.write( "So, the final speed of the two GLUED objects is    .     (1)\r\n" );
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document.write( "When the units in the problem are from different systems (as kg and mph), it reminds me a ZOOPARK, not a Physics problem.\r\n" );
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document.write( "Good style requires to CONVERT and to use all the values in consistent system.\r\n" );
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document.write( "But in this case, due to the linear nature of the basic formula (1), \r\n" );
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document.write( "you can use kg and mph (but remembering that it is not a good style !)\r\n" );
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\n" ); document.write( "\n" ); document.write( "Solved :   you got all necessary instructions from me.\r
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\n" ); document.write( "\n" ); document.write( "Such collision is called   \"inelastic collision\", or \"plastic collision\".\r
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\n" ); document.write( "\n" ); document.write( "An antonym notion is called   \"elastic collision\".\r
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\n" ); document.write( "\n" ); document.write( "Do not forget to post your \"THANKS\" to me for my teaching.\r
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