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Statement I : To determine the motion of the centre of mass of a system, knowledge of internal forces of the system is required.Statement II : For this purpose we need not to know the external forces on the system.

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a

If both statement I and statement II are true and statement II is the correct explanation of statement I.

b

If both statement I and statement II are true but statement II is not the correct explanation of statement I.

c

If statement I is true but statement II is false

d

If statement I is false and statement II is correct

answer is D.

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Detailed Solution

To determine the motion of the centre of mass of system, no knowledge of internal forces of the system required. For this purpose, we need to know only the external forces on the system.

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Statement I : To determine the motion of the centre of mass of a system, knowledge of internal forces of the system is required.Statement II : For this purpose we need not to know the external forces on the system.