A 60 kg astronaut is on a spacewalk when the tether line to the shuttle breaks. The astronaut is able to throw a spare 15 kg oxygen tank in a direction away from the shuttle with a speed of 10 m/s, propelling the astronaut back to the shuttle. Assuming that the astronaut starts from rest with respect to the shuttle, find the astronaut's final speed with respect to the shuttle after the tank is thrown.

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