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A block of mass 10 kg is placed on a rou...

A block of mass `10 kg` is placed on a rough horizontal surface and is acted upon by a variable force `F` horizontaly. The coefficient of friction between block and surface is `mu`. The force `F` staring from a value of zero is increaseed linearly to `100 N` in `4 s` and then abruptly decreased to `40 N` which is then continued for `3 sec`. and then force is removed.

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