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 alernative(s) if `H=2R`.

Options

A. the particle reaches the top of the loop with zero velocity
B. the particle reaches the top of the loop with a non- zero velocity
C. the particle breaks off at a height h=r from base
D. the particle breaks off at a height `r lt h lt 2r`

Answer

D