A smooth circular groove has a smooth vertical wall as shown in figure. A block of mass \( m \) ...

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A smooth circular groove has a smooth vertical wall as shown in figure. A block of mass \( m \) moves against the wall with a speed \( v \). Which of the following curve represents the correct relation between the normal reaction on the block by the wall \( (N) \) and speed of the block \( (v) \) ?
(a)
(b)
\( (c) \)
(d)
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