$A$ particle of mass $m$ is released from a height $H$ on a smooth curved surface which ends into a vertical loop of radius $R$,as shown. Choose the correct alternative$(s)$ if $H = 2R$.
- AThe particle reaches the top of the loop with zero velocity.
- BThe particle cannot reach the top of the loop.
- CThe particle breaks off at a height $R < h < 2R$.
- DBoth $(B)$ and $(C)$.
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