Question

a block of weight 100N is situated on a rough inclined plane. The minimum external force required to pull this block in upward direction is 10(5 root 3+1)N and the block slides down with a force of 10(5root3-1)in the absence of external force. If the same plane is kept horizontal the minimum force required to move the block is 20N. The coefficient of friction and the inclination of the inclined plane are?
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Answer 1

Answer:

As is clear from figure, <br>

<br> Net force on the block doen the incline <br>

<br> distance moved,

<br> In equilibrium, work done

P.E. of stretched spring <br>

<br>

<br>

<br>