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It said I do not need to know the mass. Please round the answer to 3...

It said I do not need to know the mass. Please round the answer to 3 significant figures

An object of mass m, initially at rest at the origin, explodes into two pieces. The first piece, 78.9 percent of the mass, moves along the negative x-axis at 8.55 m/s. Find the speed, in m/s, of the other piece right after the explosion.

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