$ABCDE$ 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

821-2108

  • 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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