In a two-block system, an initial velocity v (with respect to the ground) is given to block A (on top of rough block B, which rests on a smooth floor). Choose the correct statement.

JEE Main Physics question

In a two-block system, an initial velocity (with respect to the ground) is given to block (on top of rough block , which rests on a smooth floor). Choose the correct statement.

(A)The momentum of block is not conserved
(B)The momentum of the system of blocks and is conserved
(C)The increase in momentum of is equal to the decrease in momentum of block
(D)All of the above are correctCorrect

Answer: (D)

Solution

Friction between and is an internal force for the + system (the floor beneath is smooth, so no net external horizontal force acts on the pair). Hence total momentum of is conserved (B),

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Question ID VK-158701