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The body of mass 400 g slides on a rough...

The body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find a. the angle made by the contact force on te body with the vertical and b. the magnitude of the contact force. Take `g=10 m/s^2`

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Let the contact force on the block by the surface be F which makes an angle `theta` with the vertical ure .
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