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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

Verified by Experts

The correct Answer is:
B
At the time of collision impulsive force are internal for box plus ball system.
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