A small block of mass $m$ slides along a smooth frictional track as shown in the figure. If it starts from rest at $P$ , velocity of block at point $Q$ is
A small block of mass $m$ slides along a smooth frictional track as shown in the figure. If it starts from rest at $P$ , velocity of block at point $Q$ is
- A
$\sqrt {2gR} $
- B
$\sqrt {3gR} $
- C
$2\sqrt {2gR} $
- D
Zero
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