In which case does a boy develop great power, evenly lifting a bucket of water weighing 10 kg from a well 3 m deep

In which case does a boy develop great power, evenly lifting a bucket of water weighing 10 kg from a well 3 m deep: when does he raise it in 10 seconds or in 15 seconds?

When raising a bucket of water in 10 seconds, the boy develops more power, since under equal conditions he spends less time.

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