How fast do astronauts move while spacewalking?
Their speed is limited mainly by how often they have to do 'tether swaps'. To prevent floating away, they must have a tether attached to a handrail at all times in addition to their safety tether line that moves along with them and extends to a max length.
So you attach to the next handrail, detach from the previous, move to the end and repeat. As Calvin mentioned their path is planned out and rehearsed and they are trained to move slowly and deliberately.
His 0.5 m/s is a good top estimate. If there were an emergency, they could detach their other tethers and simply pull themselves along their safety tether back to the airlock as fast as they could go hand over hand.
When they enter the foot restraint on the station robotic arm and are moved around by it, the arm programming is set to limit its max movement rate to less than 20 cm per second.
While theoretically things could be done faster everything is VERY SLOOOOW to minimize risk.
This information was taken from Quora. Click here to view the original post.
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