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Q.

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 velocity of the centre of mass

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a

of the box remains constant

b

of the (box + ball) system remains constant

c

of the ball remains constant

d

of the ball relative to the box remains constant

answer is B.

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Detailed Solution

As no external force acts on the (ball + box) system, hence velocity of the system remains constant.
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