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Question

A ball kept in a closed box moves in the box making collisions with the walls . The box is kept on a  smooth surface . The centre of mass


Options:
A .  of the box remains constant
B .  of the box plus the ball system remains constant
C .  of the ball remains constant
D .  of the ball relative to the box remains constant
Answer: Option B

Since , no external force is present on the system . So the centre of mass if system will not be changed.

Hence , (B) is correct .



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