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1.0-kg grenade explodes into four pieces, all moving parallel to the ground. The first piece of...

1.0-kg grenade explodes into four pieces, all moving parallel to the ground. The first piece of mass 0.20 kg moves east at 24 m/s. The second piece of mass 0.30 kg flies north at 18 m/s. A third piece of mass 0.25 kg is directed west at 30 m/s. What is the velocity of the fourth piece?

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