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A ball kept in a close box moves in the ...

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

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

Text Solution

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The correct Answer is:
B
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