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A man of mass 50 kg is pulling on a plan...

A man of mass 50 kg is pulling on a plank of mass 100 kg kept on a smooth floor as shown with force of 100 N. If both man & plank move together, the force of friction acting on man is `(100)/(x)`N. What is x ?

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The correct Answer is:
3 N
If the blocks are not sliding w.r.t each other than they can be considered one system
`F - f = 3a` maximum value of a = 0
`F - 0.1 xx 3kg xx10ms^(-2)=0`
F = 3N
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