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Physics A Level question help

I'm really stuck on this homework question from isaac physics:

A boy whirls a 30g conker around his head in a circle at a speed of 2.2m/s
, using a taut inextensible string. How much work is done on the conker by the tension in the string?


That's all the information given.
Reply 1
Keeping it going at a constant angular velocity... Is there any continual increase in the energy of the system? If not its going to be like a flywhee turning at a constant speed or a satellite in orbit.
Reply 2
Or looking at it another way the conker isnt changing its distance from the centre so you've got force but no change in distance.

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