A small object of mass m starts from rest at the position shown and slides along the fricationless loop-the -loop track of radius R. What is the smallest value of y such that the object will slide without losing contact with the track?

Options

A. `R//4`
B. `R//2`
C. `R`
D. `2R`

Explanation

`V=sqrt(gR)=sqrt(2gy)`