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The bob of a pendulum was released from a horizontal position. The length of the pendulum is 10 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, g : 10 ms –2 ]

1. 1 – ms 5 6
2. 1 – ms 5 5
3. 1 – ms 5 2
4. 1 – ms 6 5

Correct answer: 1 – ms 5 6

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