If the external force acting on a system of particle is zero then …�

1.	If the external force acting on a system of particle is zero then …………..
Answer» `vec(a)_(cm)=0` `vec(V)_(cm)=0` `vec(R )_(cm)=0` `vecp=0` SOLUTION :`vecF=Mveca_(cm)` `0=Mveca_(cm)` `therefore 0=veca_(cm)`

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