A ball kept in a closed box moves in the box making collisions with th – McqOptions

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1.	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
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» C. of the ball remains constant

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