Ball on string rotating at 1 Hz, frequency when string is reeled from 5m to 3m

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tut_einstein
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A ball with mass m = 10kg is attached to one end of a massless string of length r = 5m.?
The other end of the string is fixed about a point. The ball rotates about this point at a frequency of 1 Hz/ While the ball is rotating, the string is reeled in until its length r = 3m. If the system is not otherwise disrupted in any way, what is the new frequency of rotation?
25/9 Hz
5/3 Hz
1 Hz
3/5 Hz
9/25 Hz

can you help out this hard and I've tried everything? Please


:smile:
 
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