And the c part....
mv2/R= mgcosA
V 2= RgcosA-------------------(1)
Again ½ mv2 = mg (R- RcosA)
V2 = 2gr(1-cosA)----------------(2)
From 1 and 2,
CosA = 2/3
A= Cos inverse 2/3......................................ANS
where A is the angle which the radius makes with the vertical
best of luck
...
Moderation Team
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