During simple harmonic motion of a body, the energy at the extreme position is:

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1.  **Velocity at Extreme Position:** In Simple Harmonic Motion (SHM), the particle oscillates between two extreme positions ($±A$) relative to a mean position ($x=0$). At the extreme positions, the particle comes to a momentary rest, meaning its velocity ($v$) is zero.
2.  **Kinetic Energy:** Since Kinetic Energy $K = \frac{1}{2}mv^2$, and $v=0$ at the extremes, the kinetic energy is zero.
3.  **Potential Energy:** The displacement ($x$) is maximum ($x = ±A$) at the extreme positions. The Potential Energy ($U$) is given by $U = \frac{1}{2}kx^2$. Therefore, potential energy is maximum at the extremes ($U_{max} = \frac{1}{2}kA^2$).
4.  **Conservation of Energy:** The Total Energy ($E$) in SHM is the sum of kinetic and potential energies ($E = K + U$). Since $K=0$ at the extremes, the total energy is equal to the potential energy ($E = U_{max}$). Thus, the energy is **purely potential** .

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