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Question

The adjacent figure shows an interaction force between two particles A and B against the separation between them, when the separation between them changes from zero to infinity. Parts of the curve above and below the x-axis denote attractive and repulsive forces respectively. Then, which of the following statement is incorrect?


  1. Kinetic energy of the system increases from x1 to x2
  2. Kinetic energy of the system decreases from x3 to x4
  3. Potential energy of the system decreases from x1 to x2
  4. Kinetic energy of the system increases from x3 to x4
     


Solution

The correct option is D Kinetic energy of the system increases from x3 to x4
 
From x1 to x2 interaction force is repulsive, so potential energy decreases and from x3 to x4 interaction force is attractive, so kinetic energy decreases.

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