Question

I need to know that what is the coefficient of kinetic friction

Answer 1

Answer:

Solution is in the picture.

Answer 2

Answer:

Answer is (3)

For static friction,

tan theta = coefficient of static friction.

therefore coefficient = tan 30 =1/√3=0.6

Now for kinetic friction,

s=ut+1/2at^2. (u=0)

4 =1/2*g(sintheta-coefficient*cos theta)*t^2

Solving you get 0.51 =fk

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