A Ball Is Released, from Rest, at the Left Side

Multiple Choice

A ball is released, from rest, at the left side of the loop-the-loop, at the height, h, as shown in Figure 5-3.

-Refer to Figure 5-3. If the radius of the loop is R, what minimum height h allows the ball not to fall off the track at the top of the loop?

A) 3.5 R
B) R
C) 2.5 R
D) 2.0 R
E) 3.0 R