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  4. A particle moves under force F=-5(x-2)3 . Motion of the particle is

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Q. A particle moves under force $F=-5(x-2)^{3} .$ Motion of the particle is

Oscillations

Solution:

$F=-5(x-2)^{3}$
Acceleration is negative when $(x-2)$ is positive and positive when $(x-2)$ is negative.
Hence it is an oscillatory motion about $x=2$.