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Question

A bob is suspended from a crane by a cable of length l equals 5 m. The crane and load are moving at a constant speed v subscript 0 end subscript. The crane is stopped by a bumper and the bob on the cable swings out an angle of 60 degree. The initial speed v subscript 0 end subscript is open parentheses g equals 9.8 m divided by s to the power of 2 end exponent close parentheses

  1. 10m/s    
  2. 7 m/s    
  3. 4 m/s    
  4. 2 m/s    

The correct answer is: 7 m/s

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