An object with a mass of # 15 kg# is lying on a surface and is compressing a horizontal spring by #40 cm#. If the spring's constant is # 4 (kg)/s^2#, what is the minimum value of the surface's coefficient of static friction?
Force F required to compress a spring by x unit is
hence Force exerted on the object of mass 1 kg is
This force is balanced by the then static frictional force as it is self adjusting one,
So the minimum value of the coefficient of static frictions