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Question

Two blocks of mass 4 kg and 2 kg are placed side by side on a smooth horizontal surface as shown in the figure.A horizontal force of 20 N is applied on 4 kg block.Find the acceleration of each block.


A

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B

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C

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D

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Solution

The correct option is D


Since, both the blocks will move with same accelertion (say a) in horizontal direction.Let us take both the blocks as a system. Net external force on the system is 20 N in horizontal direction.UsingFx=max20=(4+2)a=6aa=103 m/s2


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