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A collar B of mass 2kg is constrained to...

A collar B of mass `2kg` is constrained to move along a horizontal smooth and fixed circular track of radius `5m`. The spring lying in the plane of the circular track and having spring constant `200Nm^-1` is underformed when the collar is at A. If the collar starts from rest at B, the normal reaction exerted by the track on the collar when it passes through A is

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