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A collar \( B \) of mass \( 2 \mathrm{~kg} \) is constrained to move along a horizontal smooth and fixed circular track of radius \( 5 \mathrm{~m} \). The spring lying in the plane of the circular track and
\( \mathrm{P} \) having spring constant \( 200 \mathrm{~N} \mathrm{~m}^{-1} \) is undeformed when the

W 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
(1) \( 360 \mathrm{~N} \)
(2) \( 720 \mathrm{~N} \)
(3) \( 1440 \mathrm{~N} \)
(4) \( 2880 \mathrm{~N} \)
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