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A rod 5 m in length is moving in a vertical plane. When it is inclined at 60° to horizontal, its lower end is moving horizontally at 3 m/sec and upper end is moving in vertical direction. The velocity of its upper end, is

0.5 m/sec
1.0 m/sec
1.5 m/sec
2.5 m/sec
3.0 m/sec

Correct Answer: 1.0 m/sec

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