Consider a system on which there are external forces acting. If the vector sum of all these external forces is zero, then the centre of mass _____

Consider a system on which there are external forces acting. If the ve

1.	Consider a system on which there are external forces acting. If the vector sum of all these external forces is zero, then the centre of mass _____
A.	must not move
B.	may move
C.	may accelerate
D.	must accelerate
Answer» C. may accelerate

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