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Power problem

In the datasheet of the product "Metal DC Geared Motor w/Encoder - 6V 210RPM 10Kg.cm(SKU:FIT0521)", we can read this :
"Maximum Power point: Load 5.2kg·cm/110RPM/3.1W/1.1A"
I was wondering how this 3.1W Power is obtained since the torque (0,51N.m) multiplied by the speed (11.52 rad/s) gives 5,87 W !! How such a difference is possible ?
Thank you
"Maximum Power point: Load 5.2kg·cm/110RPM/3.1W/1.1A"
I was wondering how this 3.1W Power is obtained since the torque (0,51N.m) multiplied by the speed (11.52 rad/s) gives 5,87 W !! How such a difference is possible ?
Thank you