A block is kept on a rough horizontal su...

A block is kept on a rough horizontal surface as shown. Its mass is 2 kg and coefficient of friction between block and surface `(mu)=0.5.` A horizontal force F is acting on the block. When

F = 4 N, acceleration is zero.

F = 4 N, friction is 10 N and acceleration is `3m//s^(2).`

F = 14 N, acceleration is `2 m//s^(2).`

F = 14 N, friction is 14 N.

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