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The potential energy of a particle in mo...

The potential energy of a particle in motion along X axis is given by `U = U_0 - u_0` cos ax. The time period of small oscillation is

A

`frac{2pi}{a}sqrtfrac{m}{U_0}`

B

`2pisqrtfrac{m}{aU_0}`

C

`2pisqrtfrac{ma}{U_0}`

D

`2pisqrtfrac{U_0}{ma}`

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