A small block of mass \( 1 \mathrm{~kg} \) is released from rest at the top of a rough track. Th...

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A small block of mass \( 1 \mathrm{~kg} \) is released from rest at the top of a rough track. The track is a circular arc of radius \( 40 \mathrm{~m} \). The block slides along the track without toppling and a frictional force acts on it in the
\( \mathrm{P} \) direction opposite to the instantaneous velocity. The work done in overcoming the friction up to the W point \( \mathrm{Q} \), as shown in the figure below, is \( 150 \mathrm{~J} \). (Take the acceleration due to gravity, \( \left.\mathrm{g}=10 \mathrm{~m} \mathrm{~s}^{-2}\right) \)
- The magnitude of the normal reaction that acts on the block at the point \( Q \) is
- (A) \( 7.5 \mathrm{~N} \)
(B) \( 8.6 \mathrm{~N} \)
(C) \( 11.5 \mathrm{~N} \)
(D) \( 22.5 \mathrm{~N} \)
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