document.write( "Question 1195924: Johari pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 20 m/s and is batted straight back to Johari with a return speed of 15 m/s. What is the magnitude of change in the ball’s momentum?
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Algebra.Com's Answer #828554 by ikleyn(52908) $\"\"$ $\"About$

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\n" ); document.write( "Johari pitches a baseball of mass 0.20 kg. The ball arrives at home plate with a speed of 20 m/s
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document.write( "The momentum before collision with the wall was  mv = 0.2*20 = 4 (kg*m)/s.\r\n" );
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document.write( "The momentum after collision is 0.2*(-15) = -3 (kg*m)/s.\r\n" );
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document.write( "    (the sign is \" - \", (minus), because after collision the speed is in opposite direction).\r\n" );
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document.write( "Thus the change of the momentum is 4 (kg*m)/s - (-3 (kg*m)/s) = 7 kg*m/s.\r\n" );
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document.write( "ANSWER.  The change of the momentum is 7 kg*m/s.\r\n" );
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