Simple Harmonic Motion

The bob of a pendulum was released from a horizontal position. The length of the pendulum is $10 \mathrm{~m}$. If it dissipates $10 \%$ of its initial energy against air resistance, the speed with which the bob arrives at the lowest point is: [Use, $\mathrm{g}: 10 \mathrm{~ms}^{-2}$]