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Q.

When a block is placed on a wedge as shown in figure, the block starts sliding down and the wedge also start sliding on ground. All surfaces are rough. The centre of mass of (wedge + block)

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a

leftward and upward 

b

only downward

c

leftward and downward 

d

rightward and downward 

answer is B.

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Detailed Solution

Net external horizontal on wedge + block system is right ward (fr.), therefore, CM will move right ward  due to mg on block it will move downward.

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When a block is placed on a wedge as shown in figure, the block starts sliding down and the wedge also start sliding on ground. All surfaces are rough. The centre of mass of (wedge + block)