Doubt from laws of motion

Question no 38

Ans is a?

Solution?? Yes and is a

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I ask for questions no 38

Oh sorry, let me try

Please try again

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There is one more way to solve . Lets assume there is no external force on wegde i.e. acceleration zero. Now lets say the block on plane is moving with velocity v , so its momentum along x axis will be 2mvcos60 in positive x direction . And now see upper block which is moving with velocity v so its momentum will be mv in negative x direction . So overall net change in momentum is zero , so external force will be zero.

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