Solving Oscillation Problem: Find Time for Pendulum with 30m Cable

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A wrecking ball is suspended from a crane by a cable that is 30 m long. How much time is required for such a simple pendulum to make one complete oscillation? no picture was given to me

Ok this is a pendulum problem and its asking for time which is the period.

So I think that this formula should work since its a simple harmonic motion prob. and asking for Time.

T= 2pi[L/g]^1/2

T=2pi[30/9.81m/s]^1/2
T=9.61s

Is this correct or did I miss something.
 
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Well, the reasoning and the equation look fine, but I'm getting a different answer. You might check the calculation again.
 
yeah I made a calculation error. Now I got 11s as the time. Thanks Diane