First slide

Mechanical energy conservation

Question

A particle with total energy E is moving in a potential energy region U(x). Motion of the particle is restricted to the region when

Easy

A

$U (x) < E$
B

$U (x) = 0$
C

$U (x) \leq E$
D

$U (x) > E$

Solution

We know the total mechanical energy ( E ) = kinetic energy ( K ) + Potential energy ( U ). If potential energy becomes more than total energy then kinetic energy will become negative which is a practical impossibility.

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