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A shell following a parabolic path explo...

A shell following a parabolic path explodes somewhere in its flight. The centre of mass of fragements will move in

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`x_(cm)=(m+3m-8)/(2m+4)=0`
`implies4m-8=0`
`implies4m=8`
`impliesm=2kg`
Hint. External forces are zero.
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