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A small block of mass \( m \) slides along a smooth frictionless track as shown in the figure-3.113 (i) If it starts from rest at \( P \),
\( \mathrm{P} \) what is the resultant force acting on it at \( Q \) ? (ii) At what height

W above the bottom of the loop should the block be released so that the force it exerts against the track at the top of the loop equals its weight :
Figure 3.113
(A) \( \sqrt{75} \mathrm{mg}, 3 R \)
(B) \( \sqrt{65} \mathrm{mg}, 2 R \)
(C) \( \sqrt{75} \mathrm{mg}, 2 R \)
(D) \( \sqrt{65} \mathrm{mg}, 3 R \)
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