A uniform thin cylindrical disk of mass M and radius R is attached to two...

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A uniform thin cylindrical disk of mass M and radius R is attached to two identical massless springs of spring constant k which are fixed to the wall as shown in the figure The springs are attached to the axle of the disk symmetrically on either side at a distance d from its centre The axle is massless and both the springs and the axle are in a horizontal plane The unstretched length of each spring is L The disk is initially at its equilibrium position with its centre of mass CM at a distance L from the wall The disk rolls without slipping with velocity V Voi The coefficient of friction is u Figure 2d www d www x R Vo The net external force acting on the disk when its centre of mass is at displacement x with respect to its equilibrium position is A kx B 2kx C 2kx D 4kx

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