Q1 Two bars of masses m1 and m2 connected by a light spring rest on horizontal plane.The coefficient of friction between bars is equal to @.What minimum constant force has to applied to a bar in horz. direction to the bar of mass m1 in order to shift the other bar????



Q2 A spring mass system is held at rest with the spring relaxed at height H above the ground.Determine the min . value of H so that system has a tendency to rebound after hitting the ground.Given that the coefficient of restitution between m2 and ground is zero.



Q3 A body of mass m slides down a plane inclined at angle @.The coefficient of friction is $.Find the rate at which kinetic plus gravitational potential energy is dissipated at any time t.

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QUESTION 2:-

Answer has been posted in two posts.

contd.....

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QUESTION 3:-

sorry i forgot to post the figure in question2

And @ metal ans 2 is

 There was a mistake and I corrected it.

But I am not getting the answer mentioned.