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a firecracker in a coconut blows the coconut into three pieces. two pieces of equal mass...

a firecracker in a coconut blows the coconut into three pieces. two pieces of equal mass fly off south and west, perpendicular to each orher, at 18 m/s. the third piece has twice the mass as the other two. what is the speed of the third piece? what is the direction of the third piece?
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