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Q.

A mass m is at rest on an smooth inclined plane of mass M which is further resting on a smooth horizontal plane. Now if the mass starts moving the position of C.M. of mass of system will

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a

will move in the vertical direction

b

will move down in the vertical direction and changes along the horizontal

c

change along the horizontal

d

remains unchanged

answer is C.

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Detailed Solution

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The mass move under the influence of gravitational pull which acts along the vertical. Thus CM changes along vertical while it remains unchanged in the horizontal direction( As  there is no force along horizontal direction)

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