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Velocity of one object given the velocity of another.

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An 82 kg astronaut is space-walking outside the space capsule and is stationary when the tether line breaks. As a means of returning to the capsule, he throws his 3.1 kg wrench at a speed of 13 m/s away from the capsule. At what speed does the astronaut move toward the capsule?

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The velocity of one objects given the velocity of another are found. The speed the astronaut which moves towards the capsule is given.

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