A pendulum bob has a speed of 3 m/s at its lowest position. The pendulum is 50 cm long. The speed of bob, when the length makes an angle of 60º to the vertical will be (g = $10 \mathrm{~m} / \mathrm{s}^2$ ) $\_\_\_\_$ $\mathrm{m} / \mathrm{s}$.
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