$ABCDE$ is a channel in the vertical plane, part $BCDE$ being circular with radius $r$ . A block is released from $A$ and slides without friction and without rolling. The block will complete the loop if $h$ is
$ABCDE$ is a channel in the vertical plane, part $BCDE$ being circular with radius $r$ . A block is released from $A$ and slides without friction and without rolling. The block will complete the loop if $h$ is
- A
$h \leq \frac{3}{2}r$
- B
$h \geq \frac{5}{2}r$
- C
$h \geq \frac{3}{2}r$
- D
$h \leq \frac{5}{2}r$
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