Two blocks of masses 4 kg and 2 kg are connected by a string. The arrangement is placed on a rough horizontal surface as shown in figure. A time varying force F = 2t. Newton is applied to 2 kg block. The variation of friction force (f_(2)) on the 4 kg block, as a function of time, is represented by the graph :

Two blocks of masses 4 kg and 2 kg are connected by a string. The arra

1.	Two blocks of masses 4 kg and 2 kg are connected by a string. The arrangement is placed on a rough horizontal surface as shown in figure. A time varying force F = 2t. Newton is applied to 2 kg block. The variation of friction force (f_(2)) on the 4 kg block, as a function of time, is represented by the graph :
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