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[" 15.A body of mass "M" at rest explode...

[" 15.A body of mass "M" at rest explodes into "],[" three pieces,two of which of mass "(M/4)],[" each are thrown off in perpendicular "],[" directions with velocities of "3m/s" and "],[4m/s" respectively.The third piece will "],[" be thrown off with a velocity of : "],[[" 1) "1.5m/s," 2) "2m/s],[" 3) "2.5m/s," 4) "3m/s]]

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