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A particle of mass m is moving in a field. The potential energy vs  position (x ) graph is given as shown in the diagram. The dotted horizontal line represents the total mechanical energy of the particle. Find in which region the particle will not exist?
 

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detailed solution

Correct option is A

We know that K + U = E. And we also know that kinetic energy of a particle can not be negative. In region 1U > E , so kinetic energy will be negative. This is a practical impossibility.

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