As shown in figure BEF is a fixed vertical circular tube. A block of mass m starts moving in the tube at point B with velocity V towards E. It is just able to complete the vertical circle, then choose the INCORRECT option :-

Question

G1 Physics · Accepted Answer

Using energy and radial force balance around the vertical tube for the just-complete condition gives the stated speeds and reaction at F, but the reaction at E is not 6mg. Hence D is the incorrect statement.