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Questions  

A particle of mass m is executing oscillations about the origin on the X-axis with amplitude A. Its potential energy is given as U(x)=βx4, where β is a positive constant. The x-coordinate of the particle, where the potential energy is one-third of the kinetic energy, is

a
±A2
b
±A2
c
±A3
d
±A3

detailed solution

Correct option is B

U=βx4 (Given) ∴  Umax=β⋅A4 K(x)=Umax−U(x)=βA4−βx4=βA4−x4    U(x)=13K(x)   (Given)∴     βx4=13βA4−x4⇒    x=±A2

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