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A 58-kg person holding two 0.9-kg bricks stands on a 2.6-kg skateboard. Initially, the skateboard and the person are at rest. The person now throws two bricks at the same time so that their speed relative to the person is 20.0 m/s. What is the recoild speed of the person and the skateboard relative to the ground, assuming the skateboard moves without friction?

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