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A 2.5kg block is initially at rest on a ...

A 2.5kg block is initially at rest on a horizontal surface.A 6.0N horizontal force and a vertical force `vec P` are applied to the block as shown in figure. The coefficient of static friction for the block and surface is 0.4 .The magnitude of friction force when P=9N is `(g=10m/s^(2))`

1) 6.0 N

2) 6.4 N

3) 9.0 N

4) `zero`

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